HM Digital COM-100 Professional Waterproof TDS Meter & Thermometer


  •   Model # COM-100
  •   UPC 891144000007
  •   Category -

The COM-100 is a highly advanced handheld meter that is completely waterproof. The meter measures electrical conductivity (EC), total dissolved solids (TDS) and temperature. The COM-100 features three different conversion factors to convert from EC to TDS, using the KCl, 442™ and NaCl scales, as well as three temperature coefficients for each scale for both EC and TDS to automatically compensate for temperature differences higher or lower than 25° Celsius. Though the meter comes factory calibrated at 1413 micro-seimens (µS), it also features digital calibration for easy and precise calibration.


  • Measures electrical conductivity (EC), total dissolved solids (TDS) and temperature
  • Three different calibration options (KCl, 442, NaCl), each with its own non-linear conversion factor
  • Automatic Temperature Compensation (ATC) using three temperature coefficients
  • Waterproof housing (IP-67 rating)
  • Measurement Range: 0-9990 µS; 0-8560 ppm (auto-ranging)
  • Digital Calibration (push button)
  • 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-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
  • TDS Range: 0-8560 ppm (mg/L)
  • Temperature Range: 0-80 °C; 32-176 °F
  • Resolution: 0-99: 0.1 µS/ppm; 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, set 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)
  • Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches)
  • Weight: 90.7g (3.2 oz)

Additional information

Weight 1 lbs