Temperature Measurements
The temperature reading is always displayed on the LCD panel during measurement mode and is shown
simultaneously for pH and EC/TDS readings. It is not shown when the meter is in calibration mode. The default
reading for the meter is in Celsius.
1. Remove the cap.
2. Click the power button. The display will activate.
3. The temperature reading is always displayed on the LCD screen (except in calibration and reset mode) and can
be used to take air or liquid temperature measurements.
4. To measure the temperature of a water sample or solution, dip the meter into it. The temperature reading
will change immediately (unless the liquid is at room temperature). For very hot or cold liquids, the reading
may take slightly longer to stabilize.
NOTE - Because of the sensitivity of the pH sensor and reference tube, it is not recommended to use your meter as
a thermometer in very hot or very cold liquids. Do not keep the meter in very hot or cold liquids for extended
periods of time.
SWITCHING MODES
Electrical Conductivity (EC) and Total Dissolved Solids (TDS) Overview: While EC and TDS are often used
synonymously, there are important dierences to note. EC, when applied to water, refers to the electrical charge or a
given water sample. TDS refers to the total amount of substances dissolved in the water other than the pure H O. The only
true way of measuring TDS is to evaporate the water and weigh what’s left. Since this is very dicult to do for the
average person, we can estimate the TDS level by measuring the EC of the water. Every digital TDS meter in the world
rst measures the EC of the water and then converts that measurement to TDS.
All element have some electrical charge. Since dierent elements have dierent charges, it is necessary to convert the EC
to TDS using a scale that mimics the charge of that water type. The following are the most common water samples, and
for the COM-300, each has its own non-linear conversion factor:
KCl: Potassium Chloride is the international standard to calibrate instruments that measure conductivity.
The COM-300 is factory calibrated with a 1413 µS (micro-Siemens) KCl solution.
442™: Developed by the Myron L Co., 442™ simulates the properties of natural water ( rivers, lakes, wells, drinking
water, etc.) with a combination of 40% Sodium Bicarbonate, 40% Sodium Sulfate, and 20% Sodium Chloride.
NaCl: Sodium Chloride is used in water where the predominant ions are NaCl, or whose properties are similar
to NaCl, such as seawater and brackish water.
Measurements in EC (µS or mS) do not have a conversion factor.
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