TAKING MEASUREMENTS
The COM-100 can take measurements in Electrical Conductivity (EC), Total Dissolved Solids (TDS) and Temperature.
Please make sure to read the Switching Modes section to ensure that your meter displays the desired readings.
EC/TDS Measurements
1. Remove the cap.
2. Press the ‘ON/OFF’ button. The display will become active.
3. The default mode of the meter is for EC in the µS scale. To change the mode, press and hold the ‘HOLD/-
MODE’ button (see the Switching Modes section for more information). The unit will cycle through the
eight possible modes:
a. EC - µS
b. EC - mS
4. Release the ‘HOLD/MODE’ button when the display shows the desired mode.
5. Dip the meter into the water sample or solution to be tested.
6. Lightly swirl the meter and tap it against the bottom of the beaker to ensure the
removal of trapped air bubbles or electric charges.
7. The meter will display a reading almost immediately. Keep the meter in the water until
the reading stabilizes (approx. 30 seconds) for an accurate reading. NOTE – Newer
meters may take up to 2 minutes to fully stabilize. This time will decrease with usage as
the sensor adapts.
8. To view the reading out of the water, quickly press the ‘HOLD/MODE’ button while the meter is in the water.
This will hold the reading on the screen. Quickly pressing the ‘HOLD/MODE’ button again will release it.
Temperature Measurements
The temperature reading is always displayed on the LCD panel during measurement mode, and is shown simultane-
ously for either EC or TDS readings. It is not shown when the meter is in calibration mode. The default temperature
reading for the meter is in Celsius. To change the temperature mode, quickly press the ‘TEMP/CAL’ button to switch
from Celsius to Fahrenheit or from Fahrenheit to Celsius.
1. Remove the cap.
2. Press the ‘ON/OFF’ button. The display will become active.
3. The temperature reading is always displayed on the LCD panel (except in calibration mode), and is shown
simultaneously for either EC or TDS readings.
4. The default mode for temperature is Celsius. To change the temp mode, quickly press the ‘TEMP/CAL’
button to switch from Celsius to Fahrenheit or vice-versa.
5. Dip the meter into the water sample or solution to be measured.
6. The temp reading will change immediately (unless the solution is at room temperature). For very hot or
cold liquids, the reading may take slightly longer to stabilize.
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