Condensed Operating Instructions
METRACELL BT PRO
Portable Battery Tester
3-447-073-03
1/2.20
Read the full operating instructions which are
available in PDF format at www.gossenmetrawatt.com.
The condensed operating instructions do not replace
the full operating instructions!
Download Center
METRACELL BT PRO GMC-I Messtechnik GmbH
Table of Contents
1 Safety Instructions.............................................................................................................1
2 Applications .......................................................................................................................3
2.1 Intended Use / Use for Intended Purpose.................................................................. 3
2.2 Use for Other than Intended Purpose ........................................................................ 3
2.3 Liability and Guarantee .............................................................................................. 3
2.4 Opening the Instrument / Repairs .............................................................................. 3
3 The Instrument................................................................................................................... 4
3.1 Scope of Delivery ...................................................................................................... 4
3.2 Optional Accessories................................................................................................. 4
3.3 Instrument Overview.................................................................................................. 5
3.4 Relevant Standards ................................................................................................... 7
3.5 Technical Data .......................................................................................................... 8
3.6 Characteristic Values ................................................................................................. 9
4 Initial Startup ...................................................................................................................10
4.1 Electrical Power Supply ........................................................................................... 10
4.2 Attach the Carrying Strap (optional) ......................................................................... 11
4.3 Switching the Instrument On/Off.............................................................................. 11
4.4 Getting Started ........................................................................................................ 12
5 Product Support ...............................................................................................................14
6 Repair and Replacement Parts Service /
Calibration Center and Rental Instrument Service...........................................................14
7 CE Declaration .................................................................................................................15
8 Return and Disposal......................................................................................................... 16
METRACELL BT PRO GMC-I Messtechnik GmbH
1 Safety Instructions
Observe this documentation, in particular all included safety information, in order to protect
yourself and others from injury, and to prevent damage to the instrument.
• Carefully and completely read and adhere to these condensed operating instructions, as
well as the instrument’s operating instructions.
The respective documents can be found at http://www.gossenmetrawatt.com. Retain
these documents for future reference.
• Tests may only be performed by a qualified electrician, or under the supervision and
direction of a qualified electrician. The user must be instructed by a qualified electrician
concerning performance and evaluation of the test.
• Wear suitable and appropriate personal protective equipment (PPE) whenever working
with the instrument.
• Implement adequate measures for protection against electrostatic discharge (ESD).
• Observe and comply with all applicable DIN, VDE, EN, IEC and ANSI guidelines. Inform
yourself concerning the operating company’s specifications and guidelines, as well as
those of the respective battery manufacturers.
• Batteries are electrochemical components with very high short-circuit currents. Avoid
short-circuits which endanger yourself as a user, the entire system or operating personnel.
• If the instrument doesn’t function flawlessly, remove it from operation and secure it
against inadvertent use.
• The instrument may only be used as long as it’s in good working order.
Inspect the housing before use. Pay particular attention to any possible cracks and the
insulation around the sockets.
Damaged components must be replaced immediately.
• Accessories and cables may only be used as long as they’re fully intact.
Inspect all cables and accessories before use. Pay particular attention to damaged housings, broken insulation or kinked cables.
Damaged components must be replaced immediately.
• Do not use the instrument after long periods of storage under unfavorable conditions
(e.g. humidity, dust or extreme temperature).
• Do not use the instrument after extraordinary stressing due to transport.
• Do not use the instrument in potentially explosive atmospheres.
• Use the instrument only within the specified ambient conditions.
• Use the instrument only in accordance with the specified protection class (IP code).
• The instrument must not be exposed to direct sunlight.
• The instrument, the measurement cables and the included accessories may only be
used for the measurements described in this manual.
• Only use the measurement cables, the current clamp sensors and the charger which are
included with the battery tester or listed as optional accessories.
• Only use the instrument, as well as the measuring cables and plug-on test probes, within
the specified measuring category.
• The safety measurement cables and all external cabling must not exceed an overall
length of 1 meter.
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GMC-I Messtechnik GmbH METRACELL BT PRO
• Plugging in the measurement cables and the power pack must not necessitate any
undue force.
• Connect the ground wire before connecting the voltage conducting cable, and disconnect the voltage conducting cable before disconnecting the ground wire.
• Check measurement cable continuity.
• Avoid short circuits due to incorrectly connected measurement cables.
• Make sure that the alligator clips, test probes and Kelvin probes make good contact.
• Do not move or remove the Kelvin probes during a measurement.
Unwanted sparking may otherwise occur due to test current.
• Do not remove or move the alligator clips, test probes or Kelvin probes until measurement has been completed. This is indicated by means of an acoustic acknowledgment.
• Avoid simultaneously contacting the battery and the frame or hardware, which may be
grounded.
• The battery tester is equipped with a transponder module. Determine whether or not use
of the 125 kHz frequency is permissible in your country.
• The battery tester is equipped with a Bluetooth
®
module. Determine whether or not use
of the implemented range of frequencies from 2.402 to 2.480 GHz is permissible in your
country.
• The input at the P+ measurement jack is equipped with a fuse link. The instrument may
only be used as long as this fuse is in flawless condition.
A defective fuse may only be replaced by our repair service.
• The instrument only works with inserted batteries.
• The battery charger may only be connected to electrical systems (TN or TT) with a maximum of 230/400 V which comply with applicable safety regulations (e.g. IEC 60346,
VDE 0100) and are protected with a fuse or circuit breaker with a maximum rating of
16 A.
• Do not use the instrument while the internal batteries are being charged.
• Do not use the instrument if the battery compartment cover has been removed.
Touch contact with dangerous voltage is otherwise possible.
• Always create a backup copy of your measurement data.
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METRACELL BT PRO GMC-I Messtechnik GmbH
Attention!
!
2 Applications
2.1 Intended Use / Use for Intended Purpose
Periodic testing and well-organized maintenance are necessary in order to assure the availability of stationary battery systems.
The METRACELL BT PRO is a multifunctional instrument for testing batteries and battery
blocks*. It can be used to determine the current status of the battery or battery block, and to
pinpoint concealed defects. The battery tester is used primarily for testing blocks or batteries
in stationary battery systems.
The instrument stores the measured values internally. All recorded measured values can be
viewed on site. Individual acquired values can be conveniently re-measured if necessary.
Data can be exported to the included BT PRO Manager software in order to store and evaluate the measured values. Alternatively, they can be transferred to an external computer as a
CSV file.
The battery tester is a portable instrument which can be held in the hand while performing
measurements.
Safety of the operator, as well as that of the instrument, is only assured when it’s used for its
intended purpose.
Read and adhere to the operating instructions. Full operating instructions can be
found at http://www.gossenmetrawatt.com.
2.2 Use for Other than Intended Purpose
Using the instrument for any purposes other than those described in these condensed operating instructions, or in the instrument’s operating instructions, is contrary to use for intended
purpose.
2.3 Liability and Guarantee
GMC-I Messtechnik GmbH assumes no liability for property damage, personal injury or consequential damage resulting from improper or incorrect use of the product, in particular due
to failure to observe the product documentation. Furthermore, all guarantee claims are rendered null and void in such cases.
2.4 Opening the Instrument / Repairs
The instrument may only be opened by authorized, trained personnel in order to ensure flawless, safe operation and to assure that the guarantee isn’t rendered null and void. Even original replacement parts may only be installed by authorized, trained personnel.
Unauthorized modifications to the instrument are prohibited.
If it can be ascertained that the battery tester has been opened by unauthorized personnel,
no guarantee claims can be honored by the manufacturer with regard to personal safety,
measuring accuracy, compliance with applicable safety measures or any consequential
damages.
*
A block is the smallest unit in a system. A group of two or more blocks is called a battery.
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GMC-I Messtechnik GmbH METRACELL BT PRO
3 The Instrument
3.1 Scope of Delivery
Please check for completeness.
1 METRACELL BT PRO 2 Alligator clips (KY95-3)
4 1.2 V AA batteries 1 Set of multimeter test probes (KS29)
1 Power pack 2 Kelvin probes for 4-wire measurement
1 Rubber holster 1 BT PRO Manager
(battery tester management software)
1 Carrying strap 1 Test report / factory calibration certificate
1 Carrying case 1 Condensed operating instructions
3.2 Optional Accessories
Some measurements necessitate optional accessories:
– 1 AC/DC current clamp sensor (CP1800)
– 1 METRATHERM IR BASE temperature sensor
– Replacement contact pins for the Kelvin probes
– RFID tags (frequency: 125 kHz, WorldTag™)
Please contact our product support team for further information on accessories (
Values recorded and stored with a DMA 35 portable density meter from Anton Paar GmbH
can be transferred to the battery tester. Referred to the operating instructions for information
on how to use the density meter with the METRACELL BT PRO (available at http://
www.gossenmetrawatt.com). Please contact Anton Paar GmbH for any further information
concerning the DMA 35 density meter.
14).
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METRACELL BT PRO GMC-I Messtechnik GmbH
Measuring input S+
Recharging socket
(charging cable
connection)
Infrared interface
Display
Function keys
Measuring input S−
Measuring input P+
Measuring input P−/COM
RFID reader
Holster
(removable)
Carrying strap eyelets
Retaining magnet
Carrying strap eyelets
Battery compartment
cover (under holster)
Retaining clip
Recharging socket
(charging cable
connection)
Infrared interface
Measuring input S-
Measuring input S+
Measuring input P+
Measuring input P−/COM
3.3 Instrument Overview
Front
Back
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GMC-I Messtechnik GmbH METRACELL BT PRO
Note!
Attention!
!
Measuring Inputs
All measuring inputs refer to ground and reference potential, P/COM input. The measuring
inputs are not electrically isolated from each other.
The measuring ranges depend on the respective measuring inputs.
Measuring Input
Description
S− Input for measuring DC voltage.
Measuring range: ±2450.00 mV
Input impedance: > 10 M
DC
Resolution: 0.01 mV
Sensing lead to minus pole during resistance measurement.
P−/COM Reference potential (ground potential) of all measuring inputs.
Current conducting cable to minus pole during resistance measurement.
S+ Measuring input for direct and alternating voltage measurements.
Measuring ranges: ±24.5000 V
±600.000 V
±300.000 V
Input impedance: 1.6 M
DC
DC
AC
Resolution: 0.1 mV
Resolution: 1 mV
Resolution: 10 mV
Sensing lead to plus pole during resistance measurement.
P+ Current conducting cable to plus pole during resistance measurement.
Max. 24 V DC
Maximum test voltage must not exceed 24 V
The instrument is damaged if this value is exceeded.
at input P+.
DC
600 V CAT III refers to measuring inputs S+, S− and P−/COM.
RFID Reader
The display is surrounded by an RFID reader. If individual batteries or the entire system are/is
equipped with an RFID tag, the tag can be scanned before measurement, thus making it
possible to subsequently assign the measurement data to the respective unit automatically.
The RFID reader can read RFID tags which use a frequency of 125 kHz (WorldTag™).
In order to read an RFID tag, hold the battery tester display 1 to 2 cm above the RFID tag.
“RF” appears at display.
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METRACELL BT PRO GMC-I Messtechnik GmbH
Function Keys
Key Function
“Function” key
– Switch on and off
– Press briefly: Return to next higher menu level or cancel measurement
– Press and hold: End measurement or reactivate
Scroll down key “▼”
Selection of menu items or digits in downward direction.
Scroll up key “▲”
Selection of menu items or digits in upward direction.
“OK” key
–Open menus
– Execute functions
– Confirm entries
– Select digits
– Proper termination of measurements
– Press and hold: Repeat measurement
3.4 Relevant Standards
The battery tester has been manufactured and tested in accordance with the following safety
regulations:
IEC 61 010-1
EN 61 010-1
VDE 0411-1
EN 60 529
VDE 0470, part 1
DIN EN 61 326-1
VDE 0843-20-1
7
Safety requirements for electrical equipment for measurement,
control and laboratory use – general requirements
Test instruments and test procedures
Degrees of protection provided by enclosures (IP code)
Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 1: General requirements
GMC-I Messtechnik GmbH METRACELL BT PRO
Note!
3.5 Technical Data
Power Supply
Input Impedance
Ambient Conditions
Electrical Safety
Electromagnetic
Compatibility (EMC)
Mechanical Design
Data Interfaces
Rechargeable NiMH batteries, 4 ea. 1.2 V type AA
(recommended: Ansmann maxE 2500 mAh)
Measuring input S+: 1.6 M
Measuring input S–: > 10 M
Operating temperature: +5 ... +40 °C
Storage temperature: -20 ... +60 °C
Relative humidity max. 75%,
no condensation allowed
Elevation: max. 2000 m
Measuring category: 600 V CAT III
Pollution degree: 2
Protection category: II per IEC 61 010-1 /
EN 61010-1 / VDE 0411-1
Fuse link: 1 ea. SIBA 600 V/10 A FF
Test voltage: Test voltage at measuring
connection P+ may not exceed
.
24 V
DC
Interference emission: EN 61326-1:2013, class A
Interference immunity: EN 61 326-1:2013
EN 61326-2-1:2013
Protection: Housing: IP40
per DIN VDE 0470, part 1/EN 60 529
(protection against ingress of solid foreign
objects: 1.0 mm dia., protection against
ingress of water: not protected)
Housing: approx. 9.6 × 15.4 × 3.3 cm (W × H × D)
Weight: approx. 0.45 kg
(without rubber holster)
Display: LCD, monochrome, luminous
IrDA: Connection for DMA 35 density meter,
version 3
RFID: Connection for RFID tag (WorldTag™)
®
Bluetooth
: Connection for PC, headset or DMA 35
density meter, version 4
Technical data for the AC/DC current clamp sensor, the temperature sensor and the
DMA 35 density meter can be found in the respective product documentation.
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METRACELL BT PRO GMC-I Messtechnik GmbH
Note!
3.6 Characteristic Values
Multimeter /
Measuring
Function
Multimeter /
Connector
Tric kl e
Charge /
Discharging /
Charging
Measured
Quantity
Display
Range
Measuring
Range
V
DC
−2450.00 …
+2450.00 mV
−2450.00 …
+2450.00 mV
V
DC
−24.5000 …
+24.5000 V
−24.5000 …
+24.5000 V
Resolution 0.01 mV 0.1 mV 1 mV 10 mV 0.01 m
Input Impedance / Test
>10M 1.6 M 1.6 M 1.6 M
Current
Intrinsic
Uncertainty
S+
±(0.05%
rdg. + 10 d)
±(0.05%
rdg. + 10 d)
•• • •
S− ••
P+ •
Multimeter /
Interval U /
Interval U+I
V
DC
−600.000 …
+600.000 V
−600.000 …
+600.000 V
±(0.05%
rdg.+ 50 d)
Multimeter Resistance
V
AC
−300.000 …
+300.000 V
−300.000 …
+300.000 V
Rel + R
ct
00.00 …
1000.00 m
00.10 …
1000.00 m
lp: approx.
2A
±(2.0%
rdg. + 10 d)
1)
±(3.0%
rdg. + 8 d)
P−/
COM
•••••
Measuring Connections
1)
Within a frequency range of 45 to 500 Hz.
Characteristic values for the AC/DC current clamp sensor, the temperature sensor
and the DMA 35 density meter can be found in the respective product documentation.
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GMC-I Messtechnik GmbH METRACELL BT PRO
Attention!
!
Attention!
!
4 Initial Startup
These condensed operating instructions only explain initial startup of the instrument and
basic operating procedures. Please refer to the full operating instructions for a complete
description of all functions and settings (available at http://www.gossenmetrawatt.com).
1. Electrical Power Supply 10
2. Attach the Carrying Strap (optional)
3. Switching the Instrument On
4. Getting Started 12
4.1 Electrical Power Supply
The battery tester is operated with rechargeable NiMH batteries. Pre-charged batteries are
shipped loose. These must be inserted before initial use.
Risk of injury due to contact with dangerous voltages.
Only use the instrument when the battery compartment cover is inserted and firmly
screwed into place.
Required tools: Philips screwdriver
The battery tester must be switched off.
All measurement cables and accessories must be removed from the instrument.
1. Remove the holster from the instrument: Press against the bottom of the holster at the
front and push it back and off of the instrument. As soon as the lower part of the instrument is exposed, pull the instrument completely out of the holster.
2. Place the instrument face down on a stable surface.
3. Loosen and remove the screw from the battery compartment cover.
4. Unlock and remove the battery compartment cover.
5. Insert the 4 included rechargeable batteries into the battery compartment, making sure
that the plus and minus poles match up with the provided polarity symbols.
11
11
Only the included batteries or those specified in the technical data (8) may be
inserted and used.
6. Place the battery compartment cover onto the battery compartment and press it until it
audibly clicks into place.
7. Secure the battery compartment cover with the screw.
8. Pull the holster back over the instrument: Observe the cut-outs in the holster for the front
panel and the connections. Push the instrument into the holster at the top first as far as it
will go. Then press on the front at the bottom until the instrument is fully reinserted into
the holster.
The batteries have now been inserted. The instrument can be used.
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METRACELL BT PRO GMC-I Messtechnik GmbH
Operating time is approximately 10 hours when the batteries are fully charged. A warning is
generated when battery voltage drops to below 4.8 V. The battery tester can be operated for
approximately one more hour after this warning is generated.
4.2 Attach the Carrying Strap (optional)
The battery tester indicates readiness for operation and successful acquisition of measured
values by means of an acoustic signal for all measurements and repeat measurements. And
thus there’s no need to observe the displays which appear at the front panel for the purpose
of visual confirmation when recording measured values.
In order to ensure freedom of movement for the operator, the battery tester can be secured
by means of various retaining devices for the entire duration of measurement:
• Carrying strap:
The operator can use the carrying strap to suspend the battery tester around his neck.
• Retaining clip:
The operator can attach the battery tester to his belt with the help of the retaining clip.
• Retaining magnet: The battery tester can be attached to magnetic surfaces such as cabinet doors with the retaining magnet.
In particular for large UPS systems laid out in multiple rows, this convenience makes work
significantly faster and easier.
The carrying strap is shipped loose and must first be inserted:
1. Pull one end of the strap out of the locking clasp. The locking clasp remains on the strap.
2. Feed the end of the strap through the eyelets on the instrument: Push the strap into one
of the eyelets at the bottom of the instrument until it comes out at the side of the instrument. The top side of the retaining clasp faces out.
3. Thread the end of the strap from above through the locking clasp on the strap.
4. Repeat steps 1 through 3 with the other end of the strap on the other side of the instrument.
5. Adjust the length of the carrying strap by pulling on its ends.
The carrying strap has now been attached.
4.3 Switching the Instrument On/Off
Switching the Instrument On
1. Press and hold the Function key for approximately 2 seconds.
The initial display appears with the instrument’s designation and version, as well as date
and time.
2. Press any key.
The main menu appears at the display. The instrument can now be used.
Switching the Instrument Off
Normally the instrument is switched off manually. If the battery tester has not been used for
more than 10 minutes, it’s switched off automatically.
1. Select SWITCH OFF in the main menu with the help of the ▼ key.
2. Press the OK key.
The display goes blank. The instrument has been switched off.
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GMC-I Messtechnik GmbH METRACELL BT PRO
Note!
The battery tester can also be switched off by pressing the Function key. The key must
be pressed and held for approximately 10 seconds to this end.
However, it’s preferable to switch the instrument off using the switch off function.
4.4 Getting Started
After switching the instrument on (11), the main menu appears at the display. This is the
central menu from which all other hierarchically subordinate menus and functions can be
accessed. All available functions can be selected via the ▼ and ▲ keys:
Function Description
MEASUREMENT Available measuring functions
DATA Data management functions
SETTINGS Parameter settings for system, measurements and data transfer
INFO Information concerning firmware version, battery charge level and mem-
SWITCH OFF Switch off the battery tester
Various measurements can be performed with the battery tester:
Measurement Description
MULTIMETER DC and AC voltage measurements without storing measured values
TRICKLE CHARGE Periodic measurement of block voltages.
DISCHARGING Multiple measurement of block voltages at short intervals during dis-
CHARGING Multiple measurement of block voltages at short intervals during
RESISTANCE Periodic measurement of the internal resistance of the blocks
TEMPERATURE Measurement of block temperature with an IR temperature sensor
CONNECTOR Measurement of voltage drop to determine connector loss between
INTERVAL U Measurement of the voltage of a battery in freely definable time intervals
INTERVAL U + I Measurement of the voltage and current of a battery at freely definable
ory occupancy
This measurement is used for quarterly recording of trickle charge voltage, for example in UPS systems.
charging
charging
blocks
(voltage curve)
time intervals (voltage and current curves)
Example: Recording of discharge current during discharging.
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METRACELL BT PRO GMC-I Messtechnik GmbH
Measurement Description
DMA 35 (IrDA) Measurement of acid density and electrolyte temperature within a block.
DMA 35 (BT) Measurement of acid density and electrolyte temperature within a block.
The following additional functions provide support when performing measurements and
evaluating measurement data:
Measurements are performed with the DMA 35 density meter (version 3)
from Anton Paar GmbH. Data is transferred from the sensor to the battery tester via infrared (IrDA).
Measurements are performed with the DMA 35 density meter (version 4)
from Anton Paar GmbH. Data is transferred from the sensor to the battery tester via Bluetooth
®
.
Additional
Function
Description
RFID Battery identification through the use of transponders (RFID tags)
®
Bluetooth – PC Transfer of measured values via Bluetooth
for backup and evaluation
on a computer
Bluetooth –
Transmission of acoustic signals to a headset via Bluetooth
®
Headset
Bluetooth –
DMA 35
Transmission of measured values from the DMA 35 density meter (version 4) from Anton Paar GmbH to the battery tester via Bluetooth®.
IrDA – DMA 35 Transmission of measured values from the DMA 35 density meter (ver-
sion 3) from Anton Paar GmbH to the battery tester via infrared.
Please refer to the full operating instructions for a complete description of how to perform the
various measurements and how to display and transmit measured values (available at
http://www.gossenmetrawatt.com).
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GMC-I Messtechnik GmbH METRACELL BT PRO
5 Product Support
If required please contact:
GMC-I Messtechnik GmbH
Product Support Hotline
Phone: +49-911-8602-0
Fax: +49-911-8602-709
E-mail: support@gossenmetrawatt.com
6 Repair and Replacement Parts Service /
Calibration Center and Rental Instrument Service
If required please contact:
GMC-I Service GmbH
Service Center
Beuthener Str. 41
90471 Nürnberg, Germany
Phone: +49 911 817718-0
Fax: +49 911 817718-253
E-mail: service@gossenmetrawatt.com
Web: www.gmci-service.com
This address is only valid in Germany. Please contact our representatives or subsidiaries for
service in other countries.
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METRACELL BT PRO GMC-I Messtechnik GmbH
7 CE Declaration
The battery tester fulfills all requirements of applicable EU directives and national regulations.
We confirm this with the CE mark. A factory calibration certificate or test report is included
with the battery tester.
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GMC-I Messtechnik GmbH METRACELL BT PRO
8 Return and Disposal
This instrument is subject to directive 2012/19/EC on Waste Electrical and Electronic Equipment (WEEE) and its German national equivalent implemented as the Waste Electrical and
Electronic Equipment Act (ElektroG) on the marketing, return and environmentally sound disposal of electrical and electronic equipment. The instrument is a category 9 product (monitoring and control instrument) in accordance with ElektroG (German Waste Electrical and
Electronic Equipment Act).
The symbol at the left indicates that this device and its electronic accessories must
be disposed of in accordance with applicable legal regulations, and not together
with household waste. In order to dispose of the device, bring it to a designated collection point or contact our product support department (
This instrument is also subject to directive 2006/66/EC on batteries and accumulators and waste batteries and accumulators and its German national equivalent implemented
as the Battery Act (BattG) on the marketing, return and environmentally sound disposal of
batteries and accumulators.
The symbol at the left indicates that batteries and rechargeable batteries must be
disposed of in accordance with applicable legal regulations. Batteries and recharge-
able batteries may not be disposed of with household waste. In order to dispose of
the batteries or rechargeable batteries, remove them from the instrument and bring
them to a designated collection point.
Separate disposal and recycling conserves resources and protects our health and the environment.
Current and further information is available on our website at
http://www.gossenmetrawatt.com under the search terms “WEEE” and “environmental
protection”.
14).
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GMC-I Messtechnik GmbH METRACELL BT PRO
© GMC-I Messtechnik GmbH
Edited in Germany • Subject to change without notice / errors excepted • A PDF version is available on the Internet
Alle Handelsmarken, eingetragenen Handelsmarken, Logos, Produktbezeichnungen und Firmennamen sind das
Eigentum ihrer jeweiligen Besitzer.
All trademarks, registered trademarks, logos, product designations and company names are the property of their
respective owners.
Phone: +49 911 8602-111
GMC-I Messtechnik GmbH
Südwestpark 15
90449 Nürnberg • Germany
Fax: +49 911 8602-777
E-mail: info@gossenmetrawatt.com
www.gossenmetrawatt.com
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