Out of stock

Out of stock


HM DIGITAL presents the COM-100

(See below) Ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, laboratories and scientific testing, pools and spas, ecology testing, boilers and cooling towers, water treatment and more.



  • Measures electrical conductivity (EC), total dissolved solids (TDS) and temperature.
  • Updated: Four scales: µS , mS, ppm, ppt  (mS and ppt are new) Three different non-linear to TDS-CE conversion factors (KCl, 442 TM, NaCl).
  • Automatic Temperature Compensation (ATC) using three temperature coefficients
  • Waterproof housing (IP-67)
  • Measuring range 0-9990µS  ; 0-8560ppm; 0 to 9.99mS; 0 to 8.56 ppt
  • Digital (push button) calibration at any point within meter range
  • Auto-off function, data-hold function and low battery indicator
  • Display: Large and easy to read LCD display includes simultaneous temperature reading.
  • Replaceable sensor (SP-C1 model)
  • Factory Calibrated: The COM-100 is calibrated with a µS 1413 solution.  The meter can be calibrated to digital calibration using the push buttons, rather than a screwdriver.
  • Includes beanie, batteries and lanyard.
  • See how the COM-100 Stacks stack up against the competition.
  • Need help deciding which meter is right for you? View our View our SDT/EC Selection Guide .


  • EC range: 0 to 9990mS; 0 to 9.99mS
  • TDS range: 0 to 8560 ppm (mg/L); from 0 to 8.56 ppt
  • Temperature: 0-80 °C ; 32-176°F
  • Resolution:  0-99: 0.1  µS /ppm/mS/ppt; 100-999: 1µS  / ppm; 1000-9990: 10µS  / ppm. Temp. resolution is 0.1°C/F
  • Accuracy:  +/- 2%
  • Accuracy: +/- 2% User selected solutions
  • TDS Conversion Factor: The non-linear conversions for KCl CE, 442 TM or NaCl. 
  • Calibration: digital push-button calibration.
  • Removable platinum electrodes : Probe
  • Housing: IP-67 Waterproof (submersible; floats)
  • Power supply:  AAA LR03/LR3 alkaline battery(ies)
  • Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches)
  • Weight: 90.7g (3.2oz)

Designed by HM Digital. Exclusive distribution.

Made in USA.

1 year warranty.

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