HM Digital EC/TDS HydroTester COM-80: Aquarium Controllers & Monitors
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HM Digital EC/TDS HydroTester COM-80

HM Digital EC/TDS HydroTester COM-80
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* Precision aquarium EC/TDS testing meter at an economical price
* Measures Electrical Conductivity (EC) in µS or mS and Total Dissolved Solids (TDS) in ppt or ppm
* Water-resistant electronic handheld meter boasts simple push button digital calibration

Economical, handheld meter puts fast and accurate EC/TDS measurement in the palm of your hand. The HM Digital EC/TDS HydroTester COM-80 is a great choice for hobbyists looking for a sensibly priced electronic tester that measures EC (Electrical Conductivity), TDS (Total Dissolved Solids) and temperature. Water-resistant combination meter measures parameters in four different scales allowing for a variety of uses and greater versatility and accuracy. Handheld EC/TDS meter is the budget-friendly choice to ensure your reverse osmosis unit is producing the purest, highest quality water for aquarium use.

Precision device boasts advanced microprocessor technology to ensure exceptional reliability. User-friendly features including multiple parameter measurement, easy-to-read LCD screen, auto-off function, automatic temperature compensation, factory calibration and more keeps high-tech water testing simple! EC measurement range of 0-9990 µS; 0-9.9 mS. TDS measurement range of 0-5000 ppm (mg/L); 0-5.0 ppt. EC and TDS resolution of 1 µS/ppm. Temperature measurement range of 33-176°F with a resolution of 0.1°F. All measurements are accurate within +/-2%. Includes a protective cap and batteries.

1000 ppm Calibration Solution available and sold separately.

What are EC and TDS?
As a general definition, EC (Electrical Conductivity) is a substance's ability to conduct electricity, whereas TDS (Total Dissolved Solids) is the combined total of any minerals, salts, or metals dissolved in water or other liquids. Both can be used as measurements either to determine water purity or to determine the quantity of nutrients in a solution and other applications. The CON-80 feature two scales for EC and two scales for TDS. For both EC and TDS, the lower the number, the purer the water, with zero being the closest to pure H2O.


  • Measures electrical conductivity (EC), total dissolved solids (TDS). Excellent 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

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
TDS Resolution: 1 µS/ppm; 0.1 mS/ppt
Temperature 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: 6.0 x 1.3 x 0.7 inches

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Digital handheld TDS tester for under $50!
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