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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. Ideal for all water quality testing, water purification applications, waste water regulation, aquaculture, hydroponics, colloidal silver, labs and 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 - 9,990 S; 0-8,560 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


  • EC range: 0 - 9,990 S; 0 - 9.99 mS 
  • TDS range: 0 - 8,560 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: £46.45 ex-VAT (£55.74 inc-VAT)

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Spare Battery Pack 0.99p (£0.83)


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