HM Digital COM-80 EC/TDS/Temp Water Resistant HydroTester

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HM Digital COM-80 EC/TDS/Temp Water Resistant HydroTester

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  • HM Digital COM-80 EC/TDS/Temp Water Resistant HydroTester


HM Digital COM-80 EC/TDS/Temp Water Resistant HydroTester


  • Measures electrical conductivity (EC), total dissolved solids (TDS).  Exellent for nutrient testing.
  • Four scales: EC: µS, mS;  TDS: ppm, ppt  
  • Automatic Temperature Compensation (ATC)
  • Water resistant
  • Measurement Range: 0-9990 µS; 0-5000 ppm; 0-9.9 mS; 0-5.0 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.
  • Factory Calibrated: The COM-80 meter is calibrated with a 1413 µS solution. The meter can be recalibrated with digital calibration using the push buttons.
  • Includes a protective cap and batteries.
  • Need help deciding which meter is right for you?



  • EC Range: 0 - 9990 µS; 0 - 9.9 mS  
  • TDS Range: 0 - 5000 ppm (mg/L); 0 - 5.0 ppt  
  • Temperature Range: 1-80 °C; 33-176 °F 
  • Resolution: 1 µS/ppm; 0.1 mS/ppt.   
  •      Temp. resolution: 0.1 °C/F 
  • Accuracy: +/- 2% 
  • EC-to-TDS Conversion Factor: NaCl (avg of 0.5). 
  • Calibration: Digital calibration by push button. 
  • Probe: Fixed 
  • Housing: Water resistant
  • Power source: 3 x 1.5V button cell batteries (included)  (model LR44 or equivalent)
  • Dimensions: 15.3 x 3.2 x 1.8 cm (6.0 x 1.3 x 0.7 inches) 
  • Weight: 53.9g (1.9 oz)




Quick Overview

The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.

Additional Information

Manufacturer HM Digital