1
DOC272.53.80033
User instructions
Gel filled ORP/Redox electrode: Model MTC10101, MTC10103,
MTC10105, MTC10110, MTC10115 or MTC10130
Safety Information
Precautionary Labels
Read all labels and tags attached to the instrument. Personal injury or damage to the
instrument could occur if not observed. A symbol, if noted on the instrument, will be included
with a danger or caution statement in the manual.
Overview
The MTC101 series is a non-refillable, gel-filled combination oxidation reduction potential
(ORP/Redox) electrode with a built in temperature sensor. The MTC10101 or MTC10103
electrode is available with a 1 or 3 meter cable and is intended for laboratory use. The
MTC10105, MTC10110, MTC101 15 or MTC1013 0 electrode is ava ilable with a 5, 10, 15 or 30
meter cable and is intended for field use. The electrode gives direct measurements of absolute
mV values in wastewater, drinking water and general applications.
Specifications
Specifications are subject to change without notice.
Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after
12 August of 2005. In conformity with European local and national regulations (EU Directive 2002/96/EC),
European electrical equipment users must now return old or end-of life equipment to the Producer for disposal at no
charge to the user.
Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return
end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.
This is the safety alert symbol. Obey all safety messages that follow this symbol to avoid potential injury. If on the
instrument, refer to the instruction manual for operation or safety information.
Specification Details
Electrode type
Digital combination electrode with a non-refillable Ag/AgCl reference and a built-in
temperature sensor
Range ± 1200 mV
Resolution 0.1 mV
Temperature accuracy ± 0.3 ºC (± 0.54 ºF)
Operating temperature range 0 to 80 °C
Storage temperature range 5 to 40 °C
Junction Open junction
Reference potential versus
Standard Hydrogen Electrode
207 mV at 25 ºC
Reference type Ag/AgCl (3M KCl)
Minimum sample depth 20 mm
Dimensions
Standard: Diameter: 12 mm (0.47 in.), Length: 103 mm(4.056 in.), Total length: 200 mm
(7.9 in.), Cable length: 1 or 3 meter (3.3 or 9.8 ft). Rugged: Diameter 12 mm (0.47 in.),
Length: 20 mm (0.78 in.), Total length: 220 mm (8.7 in.), Cable length: 5, 10, 15 or 30
meter (16.4, 32.8, 49.2, or 98.4 ft).
Cable connection Digital output and connector compatible with HQd meters
Warranty Sensor is covered by a 6 month warranty.
2 DOC272.53.80033
Preparation for use
1. Remove the locking ring and shroud (rugged model).
2. Before first use, remove the tape from the reference junctions and the label from the
electrode body. Refer to Figure 1.
3. Rinse the reference junctions and platinum electrode with deionized water and blot
dry with a lint-free cloth.
4. If the electrode will not be used immediately, fill the storage cap halfway with Hach
Electrode Storage Solution or 3M KCl and install the cap.
5. Install the shroud and locking ring and hand-tighten (rugged mo del).
Figure 1 Probe overview
1 Shroud (rugged model) 5 Rugged probe (5, 10, 15 or 30 meter cable)
2 Electrode storage cap 6 Standard probe (1 or 3 meter cable)
3 Platinum electrode and temperature sensor 7 Electrode storage cap lid
4 Reference junctions and tape 8 Locking ring (rugged model)
DOC272.53.80033 3
Calibration
Calibration notes
• Probes are initially calibrated at the factory. However, re gular calibration by the user is
recommended for best measurement accuracy.
• Additional standards can be selected in the MTC101 Calibration Options.
• ZoBell’s redox potential is temperature dependent. The HQd calibration routine
factors in this temperature dependency allowing accurate calibrations withi n the
temperature range of 0 - 30 ºC. Light’s solution should be read @ 25 ºC. Custom
ORP/Redox calibration solution values and temperature are user defined.
• The calibration is recorded in the electrode and the data log. The calibration is also
sent to a PC, printer or flash memory stick if connected.
Before calibration:
The probe must have the correct service-life time stamp. Set the date and time in the meter before attaching the probe.
It is not necessary to recalibrate when moving a probe from one HQd meter to another if the additional meter is configured to
use the same calibration options. If the additional HQd meter uses different calibration options (e.g. standard calibration
routine), calibrate the probe or change the method settings/select a different method.
To view the current calibration, select DATA LOG KEY, View Probe Data, then View Current Calibration.
If two probes are connected, push the UP or DOWN arrow to change to the single display mode to show the Calibrate
option.
ORP/Redox standards should not be diluted. Always use fresh ORP/Redox standard for calibration.
Stir gently. Avoid resting the electrode on the bottom or sides of the container.
Refer to the troubleshooting section for calibration errors (Troubleshootin g on page 13).
4 DOC272.53.80033
Note: Procedures also apply for rugged model probes.
1. Connect the
electrode to the
meter.
2. Add fresh
ORP/Redox
standard to beaker
or appropriate
container.
3. Select
Calibrate. The
display will show the
required
ORP/Redox
standard solution.
4. Rinse the
electrode with
deionized water , blot
dry and place it in
the standard
solution. Make sure
that the sample
level is above the
reference junction.
5. Push Read. Stir
gently. The display
will show
Stabilizing... and a
progress bar as the
probe stabilizes in
the standard.
6. The display will
show the standard
solution value and
the mV offset when
the reading is
stable. Select Done
to view the
calibration
summary.
7. The display will
show the calibration
summary. Select
Store to accept the
calibration and
return to the
measurement
mode.
DOC272.53.80033 5
Run check standard
The run check standard feature validates instrument performance between sample
measurements. Use the run check standard feature for periodic or user-defined interval
measurement of a traceable standard solution. Set the criteria for check standards from
the MTC101 settings menu.
Note: Access control must be off or a valid password entered before any of the check standard
method options can be changed.
1. Select Run Check Standard from the Meter Options menu.
Note: Select the appropriate probe if two probes are connected to the meter.
2. Obtain the standard solution specified in the display.
3. Place the electrode in the standard solution and select
READ. The display will show
Stabilizing... and a progress bar as the electrode stabilizes in the standard. The
display shows the value of the check standard and either Chec k Standard Passed or
probe Check Standard Failed.
If the display reads Check Standard Passed, the check standard measurement is
within the accepted limits defined by the administrative user. Select
DONE to proceed
with sample measurement.
If the display reads Check Standard Failed, the measurement is o utside of accepted
limits defined by the administrative user and a recalibration is suggested. If the
acceptance criteria is set to Cal Expires on Failure: Yes, the display will show the
calibrate icon with a question mark until the electrode is recalibrated. Recalibrate the
electrode to correct the status indicator (Calibration on page 3).
Measurement
Measurement notes
• Data is stored automatically in the data log when
PRESS TO READ or INTERVAL is
selected in the Setup Measurement Mode.
• To significantly reduce the response time for reducing-type samples:
• The platinum disc must be clean and smooth.
• Immerse the platinum disc for 3-10 minutes in Reducing Solution for ORP
Electrodes prior to sample analysis.
• Rinse the electrode with sample, then measure.
Before measurement:
The electrode must have the correct service-life time stamp. Set the date and time in the meter before attaching the
probe.
The probe is factory calibrated and ready for use. For applications that require greater accuracy and precision, verify the
user calibration with check standards or perform a user calibration. Routine calibrations are req uired (Calibration on page 3).
Make sure that the platinum electrode is clean before sample measurement (Clean the probe on page 9).
If complete traceability is required, enter a sample ID and operator ID before measurement.
Refer to the troubleshooting section for measurement errors (Troubleshooting on page 13).
Stir samples gently during measurement.
When deploying the rugged probe at a distance, toss the cell body with a gentle underhand throw. Swinging the probe by the
cable may cause injury to the user, will cause severe strain on the cable and will shorten the service life of the cell. Damage
under these conditions may not be covered by the product warranty.
6 DOC272.53.80033
Note: Procedures also apply for rugged model probes.
1. Prepare the
electrode for use
(Preparation for use
on page 2).
2. Connect the
electrode to the
meter.
3. Rinse the
electrode with the
sample and place
the electrode in
fresh sample.
4. Push Read. The
display will show
Stabilizing... and a
progress bar as the
probe stabilizes in
the sample. If
required by the
application, also
record the sample
pH and
temperature.
5. Repeat steps 3.
and 4. for additional
measurements.
DOC272.53.80033 7
Measurement - conversion to SHE reference
For some applications it is customary to report redox potential readings relative to the
standard hydrogen electrode (SHE), also called normal hydrogen electrode (NHE). To do
this, select the value in Table 1 Standard potential of reference elect ro de that
corresponds to the temperature of the solution measured. Substitute that value E
ref
into
the equation and solve for E
h
:
E
h
= E + E
ref
where:
E
h
= oxidation reduction potential of the sample relative to the SHE
E = potential developed by the ORP/Redox electrode
E
ref
= potential developed by the reference electrode portion relative to the SHE (refer to
Table 1 Standard potential of reference electrode).
Table 1 shows the potentials, E
ref
, developed by the reference electrode portion relative to
the SHE at various temperatures.
Measurement - Oxidation Titrations
Oxidation-reduction, or redox titrations, provide a simple, reliable method for determining
many substances in solution. A redox titration consists of adding to an unknown sample
small increments of a titrant that converts the unknown to a different oxidation state. After
each addition of titrant, the ORP/Redox electrode develops a potential proportional to the
logarithm of the ratio of the activities of the two oxidation states.
At the inflection, or end point, the titrant has completely oxidized or reduced the unkn own,
causing a sharp change in the logarithm of the ratio of the activities of the two oxidation
states. A corresponding sharp change in the potential is developed by the platinum
electrode. Often several oxidizing or reducing species can be precisely determined in the
same solution by a single titration with several inflection points.
The following directions represent a general procedure for performing a redox titration
once the sample is prepared for measurement.
Table 1 Standard potential of reference electrode
Temperature (ºC) Electrode Potential in mV (E
ref
)
80 163.1
75 167.7
70 172.1
65 176.4
60 180.3
55 184.4
50 188.4
45 192.3
40 196.1
35 199.8
30 203.4
25 207.0
20 210.5
15 214.0
10 217.4
5220.9
0224.2
8 DOC272.53.80033
1. Fill a 10 ml
burette with a
standard titrant
solution with a
normality that is 5-10
times that of the
sample.
2. Connect the
electrode to the
meter.
3. Pipet a 50 mL
sample into a
150-mL beaker. Stir
with a magnetic
stirrer throughout the
titration.
4. Begin by adding
titrant in 0.5 - 1 mL
increments,
recording the
potential after each
addition. Near the
end point, when
large potential
changes appear , add
increments of 0.1 -
0.2 mL. Continue the
titration 3-4 mL past
the end point.
5. Plot the
electrode potential
versus volume of
added titrant and fit a
smooth curve
through the points.
The end point is the
point of inflection
(the point of greatest
slope).
6. Calculate the
normality of the
sample, N
x
, in
equivalents per liter:
N
x
= (Vt x Nt) / V
x
where:
N
t
= normality of
titrant (Eq/L)
V
t
= volume of titrant
at end point (mL)
V
x
= Volume of
sample (mL)
DOC272.53.80033 9
Maintenance
Clean the probe if the response time becomes slow (Clean the probe on page 9).
Storage
Note: For optimal performance, the reference junction must not dry out.
Short-term storage:
Store the electrode in Hach Electrode Storage Solution or 3M potassium chloride
(KCl) solution. The electrode can also be stored for up to 2 hours in a sample (if the
sample pH is not extreme).
Long-term storage:
1. Rinse the electrode with deionized water. Dry the electrode with a lint-free cloth.
2. Fill the electrode storage cap halfway with Hach Electrode Storage Solution or 3M
potassium chloride (KCl) solution.
3. Install the electrode storage cap. Make sure that the storage cap covers the refere nce
junction completely.
Rugged probe maintenance
The shroud protects the sensor elements durin g rugged applications. Damage to the
sensing elements can occur if the shroud is not installed during field use. Damage under
these conditions is not covered under warranty.
To remove the shroud:
1. Unscrew the locking ring and slide the shroud and locking ring off the probe.
2. Slide the shroud and locking ring off the probe.
To install the shroud
1. Place the locking ring on the probe body with the th re ad s tow ar d th e pla tin um disc .
2. Slide the shroud on the probe until it is seated in the locking groove.
3. Hand-tighten the locking-ring on the shroud.
Clean the probe
For general cleaning (including oils, greases, and organics):
• Rinse the electrode with deionized water and blot dry with a lint- fr ee cloth .
• Immerse the sensor array and platinum disc in Electrod e Clean in g Solu tio n or
warm detergent solution for up to 15 minutes.
Note: The platinum disc can be polished using a soft cloth or cotton swab with detergent
solution.
• Rinse the electrode sensor array and platinum disc with deionized water. Blot dry
with a lint-free cloth.
For inorganic deposits
• Immerse the platinum disc in a solution of 0.1M hydrochloric or nitric acid solution
and soak for up to 15 minutes.
• Rinse the electrode sensor array and platinum disc with deionized water. Blot dry
with a lint-free cloth.
After cleaning has been performed, condition the platinum electrode in
representative sample prior to use.
10 DOC272.53.80033
Advanced operation
Parameter-specific settings can be changed through the Full Access Options menu.
Details about menu navigation, available opti ons and how to change them are given in the
screens, tables and procedures throughout this section.
Change measurement options
Methods are groups of default or user defined settings relevant to specific applications. If
the meter is set to the default method and the Modify Current Settings option is chosen, a
prompt will display to name the method after changes are entered. The settings are saved
with this name to distinguish them from the default method settings, which cannot be
changed. A saved method can be used instead of repeatedly adjusting individual settings.
Changes made to a user defined method are automatically saved with the existing name.
Multiple methods can be saved for the same probe.
1. Make sure an electrode is connected to the meter.
2. Push the
METER OPTIONS key and select (MTC101) Settings.
3. Select Modify Current Settings.
4. Select Measurement Options.
5. Update the settings. Refer to Table 3.
Table 2 Parameter-specific settings
Setting Options
Measurement options
• Response time
• Upper and lower range limits (defines pH limits per method)
Calibration options
• Calibration reminder
• Offset limit
Check standard options
• Standard (temperature compensated for ZoBell’s solution)
• Check standard reminder
• Acceptance criteria
• Standard value (at 25 ºC if custom standard selected)
DOC272.53.80033 11
.
6. If prompted, enter a name for the new method settings. Additional changes made to
the settings of an existing method are automatically saved with the same method
name.
7. Push
EXIT until the meter returns to the meas ur em e nt mod e .
Change calibration options
1. Make sure an electrode is connected to the meter.
2. Push the
METER OPTIONS key and select (MTC101) Settings.
3. Select Modify Current Settings.
4. Select Calibration Options.
5. Update the settings. Refer to Table 4.
Table 3 Measurement options settings
Setting Options Description
Response time
Fast
Medium (default)
Slow
The response time affects the speed of the measurement by
adjusting the stabilization criteria.
Fast: 2 mV/min
Medium: 1 mV/min
Slow: 0.5 mV/min
Measurement limits
Lower limit (default: -1200.0
mV)
Upper limit (default: 1200.00
mV)
The measurement limits can be set to match the acceptable
values for the sample. When the measurement is above the
upper limit setting or below the lower limit setting, the meter
will show an "Out of limits" message.
This message is an alert to a potential problem with process
conditions.
Table 4 Calibration options settings
Settings Option Description
Standard
ZoBell’s (221mV -- 25ºC)
Light’s (468mV -- 25 ºC)
Custom
Temperature compensated for ZoBell’s
solution.
Standard values will appear on
Calibration Options screen.
Light’s solution is characterized at 25
ºC. Custom standard values and
temperature are user defined.
Calibration reminder
Reminder repeat: Off (default), 1 d, 7 d, 30 d
Meter will make an audible sound when
calibration is due. and repeat the sound
at selected interval.
Expires: Immediately, Reminder + 30 min,
Reminder + 1 hr, Reminder + 2 hr, Continue
Reading
Calibration expires after a specified
time.
Note: The meter cannot be used to read
samples after calibration has expired
unless Continue Reading is selected.
12 DOC272.53.80033
6. If prompted, enter a name for the new method settings. Additional changes made to
the settings of an existing method are automatically saved with the same method
name.
7. Push
EXIT until the meter returns to the measurement mode.
Change check standard options
1. Make sure an electrode is connected to the meter.
2. Push the
METER OPTIONS key and select (MTC101) Settings.
3. Select Modify Current Settings.
4. Select Calibration Options.
5. Update the settings. Refer to Table 5.
6. If prompted, enter a name for the new method settings. Additional changes made to
the settings of an existing method are automatically saved with the same method
name.
7. Push
EXIT until the meter returns to the measurement mode.
Offset limits ± 1 mV - 250 mV (± 25 mV default)
Offset must fall within set limits for
successful calibration.
Standard value (for custom
standard option)
Enter standard value using up/down arrow keys.
Range -1200.0 mV to 1200.0 mV
Custom standard value. Custom
standards are characterized at 25 ºC.
Table 4 Calibration options settings
Settings Option Description
Table 5 Check standard options settings
Settings Options Description
Standard
ZoBell’s (221 mV -- 25 ºC) (default)
Light’s (135 mV -- 25 ºC)
Custom
Temperature compensated for ZoBell’s
solution.
Standard value for check standard.
Standard value will appear on Check
Standard Options screen.
Light’s solution is characterized at 25
ºC. Custom standard values and
temperature are user defined.
Check standard reminder
Reminder: On or Off (default)
Allow Defer:Yes
Meter automatically displays check
standard screen if reminder is on.
Measurement of check standard can be
delayed if Allow defer: is set to Yes.
Acceptance Criteria
Acceptance Limits: ± 1 mV to 25 mV
(default: ± 10 mV)
Cal Expires on Failure:Yes or No
(default)
Values (as mV) that check standard
must fall within in order to pass.
Calibration expires if check standard
fails.
Standard value (for Custom Standard
option)
Enter standard value using up/down
arrow keys. Range -1200.0 mV to
1200.0 mV
V alue and temperature for custom che ck
standard are user defined.
DOC272.53.80033 13
Troubleshooting
Message or
symptom
Possible cause Action
Probe not supported
Software not updated
Update the HQd software to the newest revision at
www.hach.com/SoftwareDownloads. Refer to the HQd
Series Meter Manual.
HQd meter does not support IntelliCAL
probe.
Contact a Hach Technical Support Representative.
Connect a probe or
Probe requires
service
Electrode not connected properly
Disconnect, then connect the electrode. Tighten the
locking nut.
Software not updated
Update the HQd software to the newest revision at
www.hach.com/download-resources.
Damaged electrode
Verify connectivity with another electrode or meter to
confirm isolated issue with the electrode. Contact a Hach
Technical Representative.
Large number of methods stored on
probe.
Continue to let probe connect. Do not disconnect probe.
Standard not
recognized error
Storage cap not removed. Remove storage cap.
Incorrect or contaminated standard
solution
Use fresh standard solution as specified in
the method.
mV reading is same
for all solutions
Storage cap not removed Remove the storage cap.
Electrical issue Contact a Hach Technical Support Representative.
Slow response time
Contaminated reference junctions
Rinse reference junction with deionized water thoroughly,
shake the electrode downward to remove any air bubbles
and soak in 3.0 M KCl storage solution for 1-2 hours.
Contaminated platinum sensor Clean the electrode.
Electrode not conditioned/pre-treated
for reducing type samples
To significantly reduce the response time for reducing type
samples the platinum disc must undergo the following:
--The platinum disc must be clean and smooth.
--Immerse the platinum disc for 3-10 minutes in Reducing
Solution for ORP Electrodes prior to sample analysis.
--Rinse the electrode with sample, then measure.
Low sample temperature or
temperature difference between
samples.
Check the sample temperature. The lower the
temperature or the greater the difference of temperatures
between samples, traditionally the longer the response
time.
Platinum electrode not conditioned for
reducing-type samples.
The platinum disc must be clean and smooth.
Immerse the platinum disc for 3-10 minutes in Reducing
Solution for ORP Electrodes prior to sample analysis.
Rinse the electrode with sample, then measure.
Out of range
Measure value is outside the
calibration/measurement range of the
electrode.
Recalibrate using freshly prepared standards
Clean the electrode and recalibrate
Verify that the sample is within the range of the electrode
14 DOC272.53.80033
Drifting/Inaccurate
readings
Contaminated platinum disc Clean the electrode.
Clogged reference
Rinse reference junction holes with deionized water
thoroughly and gently tap the electrode with hand or
shake the electrode down to remove any air bubbles.
Improper storage conditions
Clean or condition the electrode and attempt
recalibration.The electrode may not function correctly if
the electrode has been left dry for extended periods of
time. Attempt to recondition the reference junctions by
soaking the electrode tip in a 3.0 M KCl storage solution
for 1-2 hours. Rinse with deionized water prior to use.
Electromagnetic Forces (EMF) such as
voltaic cells, thermoelectric devices,
electrical generators, resistors and
transformers.
Avoid testing in areas where EMF is present. For testing
in process units (i.e. spot checking), make sure the
equipment is grounded.
Air bubbles around inner reference
electrode
Gently tap the electrode with hand or shake the electrode
downward to remove any air bubbles
Out of limits
Check standard value is outside of limits
set in the current method
Verify that the standard is within the limits of the current
method.
Create a new method that expands the acceptable limits.
Measurement value is outside of the
measurement limits set in the current
method.
Verify that the sample is within the limits of the current
method.
Create a new method with an expanded range.
Calibration adjustment offset value
outside the limits set in the current
method.
Verify that the standard is within the limits of the current
method.
Create another method that expands the acceptable
limits.
Storage cap not removed Remove storage cap
Temperature out of
range
Calibration temperature value is outside
of range
Verify that the sample temperature is within the range of
the electrode.
Verify that the temperature sensor is working correctly.
Measured temperature is outside range
of the electrode
Verify that the standard temperature is within the range of
the electrode.
Verify that the temperature sensor is working correctly.
Check standard temperature value is
outside of range
Verify that the Check S tandard temperature is within the
range of the electrode.
Troubleshooting (continued)
Message or
symptom
Possible cause Action
DOC272.53.80033 15
Parts
Description Quantity Catalog Number
IntelliCAL ORP/Redox gel-filled
electrode, standard, with 1 m cable
1 MTC10101
IntelliCAL ORP/Redox gel-filled
electrode, standard, with 3 m cable
1 MTC10103
IntelliCAL ORP/Redox gel-filled
electrode, rugged, with 5 m cable
1 MTC10105
IntelliCAL ORP/Redox gel-filled
electrode, rugged, with 10 m cable
1MTC10110
IntelliCAL ORP/Redox gel-filled
electrode, rugged, with 15 m cable
1MTC10115
IntelliCAL ORP/Redox gel-filled
electrode, rugged, with 30 m cable
1 MTC10130
Accessories
Description Quantity Catalog Number
Standard probe accessories
Citizen PD-24 USB handy printer,
120-220 VAC
1 2960100
Color coded probe clips (5 color coded
sets)
10/pkg 5818400
Electrode storage cap 5/pkg 5857305
Electrode storage cap lid 1 5829800
Field kit (Includes glove kit, and 5 120
mL sample cups)
1 5825800
Glove kit only for HQd meters 1 5828700
IntelliCAL probe stand (for standard
probes)
1 8506600
Meter stand 1 8506600
Printer paper for PD-24, thermal 5/pk 5836000
Probe holder for HQd meter (IntelliCAL
standard models only)
1 5829400
Standard probe holder (use with
protective glove)
1 5829400
USB and AC power adapters for HQd
meters (included w/HQ40d)
1 5826300
USB/DC adapter for HQd meters (must
have 5826300, inc w/HQ40d)
1 5813400
USB keyboard for HQd meters (must
have 5813400 and 5826300)
1LZV582
Rugged probe accessories
Electrode depth marker (rugged cable
markers)
5/pk 5828610
Rugged field case for 2 probes with up
to 5 m cables (10 m total). Includes:
Empty case and insert for meter and
probe storage, (4) containers for sample
collection
1 8505500
Rugged field case for three probes with
up to 5 m cables (15 m total). Includes
same accessories as case 8505500.
1 8505501
HACH Company World Headquarters
P.O. Box 389
Loveland, Colorado 80539-0389 U.S.A. International customers:
Tel (800) -227-4224 (U.S.A. only) Tel +001 (970) 669-3050
Fax (970) 669-2932 Fax +001 (970) 669-2932
orders@hach.com • www.hach.com intl@hach.com
Rugged field case for probes with > 5
meter cables (30 m total)
Includes: Empty case and insert for
meter and two probe storage cavities,
space for storage of HQd meter with
protective glove
1 8505600
Rugged shroud kit 1 5825900
Consumables
Electrode cleaning solution 500 mL 2965249
Electrode storage solution (3M KCl) 500 mL 2756549
Light’s solution (10 mL ampules) 20/pkg 2612520
Reducing solution for ORP electrodes 500 mL 2965349
ZoBell’s ORP standard solution 1 2316949
Accessories (continued)
Description Quantity Catalog Number
© Hach Company,2009. All rights reserved. Printed in the U.S.A. Edition 1 May 2009
Loading...