version:1.0
OPTIMA HOME SCALES
User Manual
Kitchen Scale COMET
OPTIMA HOME SCALES
PO Box 1526 Cumming GA 30028, UNITED STATES
TEL: 888-688-4833 www.optimahomescales.com
Thank you very much for purchasing the OHS Kitchen Scale
COMET.
Please read the user manual carefully and thoroughly to ensure the safe
usage of this product and keep the manual for further reference in case
you have problems.
Table of Contents
Safety Instructions
Warning Symbol
.................................................................................................................
2
Safety Instructions
......................................................................................................................... 2
Product Overview
General Instructions ...................................................................................................................... 3
Device Components ...................................................................................................................... 3
Function Indication
.................................................................................................................
3
List .................................................................................................................................................. 4
LED Display ................................................................................................................................... 4
Initial Start-Up
Replace the Batteries .................................................................................................................... 5
Changing the Weight Unit
............................................................................................................. 6
Operation
Weighing Mode
...................................................................................................................
7
Measuring with Tare Function........................................................................................................ 8
Troubleshooting .............................................................................................................................. 10
Specifications .................................................................................................................................. 11
Maintenance ..................................................................................................................................... 12
Warranty ........................................................................................................................................... 12
Appendix
EMC Guidance .............................................................................................................................. 13
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Table of Contents
Warning Symbols
It is important to understand the meanings of the warning symbols to ensure a
correct and safe use of the product and protect you and others from injury. You may
find the meanings of the warning symbols, which you may see in the label or this user
manual, as follow:
General Instructions
OHS Kitchen Scale COMET is used to measuring the food’s weight. This
device has practical weighting function(tare) with digital LED.
Main Features:
a. Classically elegant design
b. Easy to read digital display
c. With tare function
Device Components
Battery Compartment Cover
Safety Instructions
• Always place the scale on a solid, level and flat surface to weigh.
• Always place the object to be weighed at the center of the weighing platform.
• Do not place any object on the weighing platform before switching the scale on.
• If the scale is not to being used for a long period, please remove the batteries.
• Clean the scale with a slightly damp cloth, DO NOT immerse the scale in water
or use chemical/abrasive cleaning agents.
• Keep the scale in a cool dry area.
UNIT Button
ON/OFF/TARE Button
LED Display
Function Indication
Press the ON/OFF/TARE button to switch the scale on.
Press and hold the ON/OFF/TARE button for 2s to switch the scale off.
Press the ON/OFF/TARE button to reset the display to zero.
Press to the UNIT button to select your desired weight unit.
2 3
Safety Instructions
Product Overview
Symbol for “THE OPERATION
GUIDE MUST BE READ”
Symbol for “COMPLIES WITH EU
REQUIREMENTS”
Symbol for “DIRECT CURRENT”
Symbol for “ENVIRONMENT
PROTECTION – Waste electrical
products should not be disposed of with
household waste. Please recycle where
facilities exist. Check with your local
authority or retailer for recycling advice”
Symbol for “MANUFACTURER”
Symbol for “SERIAL NUMBER”
ON/OFF
TARE
UNIT
Product Overview Initial Start-Up
List
1. Kitchen Scale COMET
2. 3PCS AAA Batteries (1.5V per each)
3. User Manual
LED Display
Replace the Batteries
Open the battery door in the back of the scale.
Insert the batteries (3 x 1.5V AAA) into the battery
compartment according to the polarity indications
marked inside the compartment.
Close the battery door. The LED displays as below:
CAUTION
When the symbol “ ” appears, the device will power off soon. Then you shall replace with a new
set of batteries. Please replace both two batteries at the same time. Do not mix the old batteries with
the new one.
Worn batteries are hazardous waste. Do NOT dispose of them together with the household garbage.
Please refer to the local ordinances and recycling instructions regarding disposal of the worn batteries.
To achieve the best performance and protect your scale, please use the authorized/specified batteries.
Tare Function Negative value
Volume Unit (Milliliter)
Weight Unit (Gram)
4
5
Initial Start-Up Operation
Changing the Weight Unit
In weighing mode, press the UNIT button to select your desired unit (g,fl:oz,lb.oz,ml).
The units will be displayed in the LED display. (The default unit is g)
CAUTION
When finishing the unit selection, you may start to weigh according to
the weighing procedure below. If there is not any operation and the
weight is steady in weighing mode, the scale will turn off automatically
after about 1 minute.
Weighing Mode
Before weighing, you may select your desired weight unit.
(Refer to Changing the Weight Unit for more details)
1. Place the scale on a solid, level and flat surface to weigh.
2. Do not put any things on the scale.
3. Press the ON/OFF/TARE button lightly to go to the weighing mode.
4. You can start to weigh when “0” is shown on the LED.
5. Place the item you wish to weigh onto the scale, the weight data will be shown.
CAUTION
If there is no operation, the scale will turn off automatically in
about 1 minute. Or you can press and hold the ON/OFF/TARE
button for about 2s to turn off it.
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7
Operation
Troubleshooting
Measuring with Tare Function
TARE function allows you to weigh different items consecutively without removing
the items from the scale.
1. When the scale is off, press the ON/OFF/TARE button to go to the
weighing mode. You can start to weigh when “0” is shown on the
LED.
2. Place the first item you wish to weight onto the scale, the LED will show the
weight of the first item.
3. Press the ON/OFF/TARE button to reset the display to zero.
CAUTION
If the weight is less than 600g, the "TARE" icon will not appear
on the display by pressing the ON/OFF/TARE button.
4. Now add another item to weigh onto the scale. The LED will show the weight
of the newly added item.
5. If you remove the item added to the scale, the LED will again show zero. But if
you remove all items from the scale, the LED will show a negative value indicated
by a minus sign.
6. When it shows the negative value, press the ON/OFF/TARE button again, it will clear
to zero.
7. If there is no operation, the scale will switch off automatically in about 1 minute. Or
you can press and hold the ON/OFF/TARE button for about 2s to switch the scale off.
8
9
Troubleshooting
Specifications
About the Accuracy of This Product
This product passes strict inspection before delivery and therefore its accuracy is guaranteed by the manufacturer.
Please refer to the above table for the descriptions on accuracy.
WARNING: No modification of this equipment is allowed.
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Product Name
Kitchen Scale
Dimension
Whole size:269.3*266.6*33.8(mm) (Approximately)
Net Weight
Approx. 1.02kg
Display
Digital LED
Measurement Unit
g / fl: oz / lb: oz / ml
Measurement Range
15000 g/529. 1fl.oz/33lb:1.1oz/15000 ml
Minimal Weight
2 g
Division
1g /0. 1fl.oz /0.1oz/ 1 ml
Accuracy
F.S*3 ‰+1d
Working Environment
Temperature: 5℃ to 40℃ Relative Humidity: ≤90% RH
Atmospheric pressure: 86kPa to 106kPa
Storage Environment
Temperature: -20℃ to 60℃ Relative Humidity: ≤90% RH
Atmospheric pressure: 50kPa to 106kPa
Power Source
4.5V (3x1.5V AAA batteries)
Auto-Off
About 1 minute after clearing,
or about 1 minute after the weight is stable.
Accessories
1. 3x1.5V AAA batteries
2. User Manual
Problem
Root Cause
Solution
The LED display
is dim or displays
The power is not enough.
Please replace with 3 x 1.5V AAA
new batteries.
The device isn’t
on when you press
the start button.
The batteries are
exhaust.
Please replace with 3 x 1.5V AAA
new batteries.
The batteries are not
inserted correctly.
Please insert the batteries
according to the indication
correctly.
The LED displays
Overload.
Please remove the weight on
the scale to protect the loadcells.
Suggest buy a new scale with
higher weight range.
The LED displays
Before you turn on the scale,
there is some things on the
scale which are over 5000g.
Remove the things from the
scale, wait until it displays zero,
then you can start weighing.
Troubleshooting
Specifications
Maintenance
When carrying out usual maintenance, please ensure practice of the following Do’s and
Don’ts:
DO use a dry soft cloth to wipe the dust.
DO use a wet soft cloth, dipped into water and wrung out, to wipe the dirt. Then use a
dry soft cloth to dry up the device.
DON’T wash the device with water or immerse it in water.
DON’T use propellant, abrasive or other chemicals to wipe the dirt in avoidance of
discolor or malfunction.
DON’T disassemble this device. If you have any problems, please contact OHS.
(Please refer to Warranty for contact information)
EMC Guidance
1. MEDICAL ELECTRICAL EQUIPMENT needs special precautions regarding EMC and
needs to be installed and put into service according to the EMC information provided in
the ACCOMPANYING DOCUMENTS.
2. Wireless communications equipment such as wireless home network devices, mobile
phones, cordless telephones and their base stations, walkie-talkies can affect this
equipment and should be kept at least a distance d = 3,3 m away from the equipment.
(Note. As indicated in Table 6 of IEC 60601-1-2:2007 for ME EQUIPMENT, a typical cell
phone with a maximum output power of 2 W yields d = 3,3 m at an IMMUNITY LEVEL of
3 V/m)
Warranty
OHS warrants its products free of defects in materials and workmanship in normal
use for a period of TWO years from the date of retail purchase.
This warranty does NOT cover damages caused by misuse or abuse, including but not
limited to:
Failure caused by unauthorized repairs or modifications;
Damage caused by shock or drop during transportation;
Failure caused by improper operation inconsistent with the instructions stated in this user
manual;
Malfunction or damage from failure to provide the recommended maintenance;
Damage caused by improper use of power supply.
Should this device require maintenance (or replacement at our option) under warranty,
please deliver the original package to ZHONGSHAN LIFESENSE ELECTRONICS CO.,
LTD prepaid. Please return the store receipt (with the retail purchase date) and a note
with reasons to return on it as well.
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Maintenance
Appendix
ZHONGSHAN TRANSTEK ELECTRONICS CO., LTD
No.23,Jin'an Road, Minzhong, Zhongshan, 528441, Guangdong, China
Tel: 86-760-88282982
Website: http://www.transtek.cn
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