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15% Off Applied at Checkout *Excludes Clearance and Sale Items
15% Off Applied at Checkout *Excludes Clearance and Sale Items

HM Digital COM-100 Waterproof EC/TDS/Temp Combo Meter

by HM
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Ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more. The COM-100 is a professional level EC/TDS meter at an unbeatable price.


Measures electrical conductivity (EC), total dissolved solids (TDS), salinity and temperature.


UPGRADED: Four scales: µS, mS, ppm, ppt (mS and ppt are new)


Three different non-linear EC-to-TDS conversion factors (KCl, 442TM, NaCl).


Automatic Temperature Compensation (ATC) using three temperature coefficients


Waterproof housing (IP-67 rating)


Measurement Range: 0-9990 µS; 0-8560 ppm; 0-9.99 mS; 0-8.56 ppt


Digital Calibration (push button) to any point within the meter's range


Auto-off function, data-hold function and low-battery indicator


Display: large and easy-to-read LCD screen includes simultaneous temperature reading.


Replaceable Sensor (model SP-C1)


Factory Calibrated: The COM-100 meter is calibrated with a 1413 µS solution. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver.


Includes a cap, batteries and lanyard.





EC Range: 0-9990 µS; 0-9.99 mS 
TDS Range: 0-8560 ppm (mg/L); 0-8.56 ppt 
Temperature Range: 0-80 °C/32-176 °F 
Resolution: 0-99: 0.1 µS/ppm/mS/ppt; 100-999: 1 µS/ppm; 1000-9990: 10 µS/ppm. Temp. resolution is 0.1 °C/F 
Accuracy: +/- 2% 
EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, selected by the user 
Calibration: Digital calibration by push button 
Probe: Detachable platinum electrodes 
Housing: IP-67 Waterproof (submersible; floats) 
Power source: 3 x 1.5V button cell batteries (included) (model LR44 or equivalent)
Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches) 
Weight: 90.7 g (3.2 oz)


1 year warranty