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COM-100: Waterproof EC / TDS / Temp Combo Meter (COM-100)
COM-100: Waterproof EC / TDS / Temp Combo Meter

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COM-100: Waterproof EC / TDS / Temp Combo Meter COM-100: Waterproof EC / TDS / Temp Combo Meter

Latest E/C and TDS Meter from HM Digital, this is a combination waterproof handheld meter. Accurate and reliable water testing device

UPGRADED! (See below) Ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more. The COM-100 is a professional level EC/TDS meter at an unbeatable price.

This item is in stock in our own warehouse for immediate shipment via first class post.



  • Measures electrical conductivity (EC), total dissolved solids (TDS), salinity and temperature.
  • UPGRADED: Four scales: S, mS, ppm, ppt (mS and ppt are new)
  • Three different non-linear EC-to-TDS conversion factors (KCl, 442TM, NaCl).
  • Automatic Temperature Compensation (ATC) using three temperature coefficients
  • Waterproof housing (IP-67 rating)
  • Measurement Range: 0-9990 S; 0-8560 ppm; 0-9.99 mS; 0-8.56 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.
  • Replaceable Sensor (model SP-C1)
  • FACTORY CALIBRATED The COM-100 meter is calibrated with a 1413 S solution. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver.
  • Includes a cap, batteries and lanyard.
  • See how the COM-100 stacks up against the competition.




  • EC Range: 0 - 9990 S; 0 - 9.99 mS 
  • TDS Range: 0 - 8560 ppm (mg/L); 0 - 8.56 ppt 
  • Temperature Range: 0-80 C; 32-176 F 
  • Resolution: 0-99: 0.1 S/ppm/mS/ppt; 100-999: 1 S/ppm; 1000-9990: 10 S/ppm. Temp. resolution is 0.1 C/F 
  • Accuracy: +/- 2% 
  • EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, selected 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)  (model 357A)
  • 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)


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Our Price: £37.75 ex-VAT (£45.30 inc-VAT)

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Spare Battery Pack 0.99p (£0.83)


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