HM Digital Meters COM-80 EC/TDS/Temp Waterproof Hydro Tester

The COM-80 is a reliable and affordable EC/TDS meter, ideal for measurement applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.

Measures electrical conductivity (EC) and total dissolved solids (TDS). Excellent for measuring nutrients in hydroponics.

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; it can be recalibrated by digital calibration using the buttons

Includes protective cap and batteries.

SPECIFICATIONS

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
Temperature Resolution: 0.1°C/F
Accuracy: +/- 2%
EC to TDS Conversion Factor: NaCl (average 0.5)
Calibration: Digital calibration via push button
Probe: Fixed
Housing: Water-resistant
Power source: 3 x 1.5V button cell batteries (included) (LR44 or equivalent model)
Dimensions: 15.3 x 3.2 x 1.8 cm (6.0 x 1.3 x 0.7 inches)
Weight: 53.9 g (1.9 oz)

Technical Data

• Brand: HM Digital | Model: COM-80 | Type: Waterproof EC/TDS/Temperature Combo Meter
• Measures EC (0.00-20.00 mS/cm), TDS (0-9990 ppm), and temperature (0-80 C / 32-176 F) in a single device
• Automatic Temperature Compensation (ATC) ensures accurate EC and TDS readings at different solution temperatures
• Selectable TDS conversion factor (0.5 NaCl or 0.7 442 factor) to suit different measurement conventions
• Fully waterproof casing suitable for submersion — includes protective cap, battery, and carrying case

How to use

• Calibrate with a standard EC solution before first use and every 1-2 weeks for accuracy
• Immerse the probe completely and wait 5-10 seconds for the reading to stabilize before recording
• Rinse the probe with clean water after each use to prevent salt and mineral buildup on the electrodes
• Change the battery (LR44 or equivalent) when the low battery indicator appears to maintain accuracy
• Store with the protective cap on — keep the probe moist between uses by placing a slightly damp cloth inside the cap