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COM-100 TDS Water Meter

HM Digital COM-100 TDS and Temperature Water Meter, HMD-COM-100
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Brand: HM Digital
Price: $65.95

Dimensions: 7.3" x 1.3" x 1.3"
Weight: 0.6 lb

In stock


COM-100 TDS Water Meter is a handheld waterproof EC/TDS/Temp Combo Meter. 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. This Electronic Water Tester measures Total Dissolved Solids(TDS) and Temperature with high precision. The COM-100 is a professional level EC/TDS meter at an unbeatable price.

Key Features & Benefits:

  • Measures electrical conductivity(EC), total dissolved solids(TDS), salinity and temperature.
  • UPGRADED: Four scales: µS, 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.
  • Push button digital calibration to any point within the meter's range.
  • Auto-off function, data-hold function and low-battery indicator.
  • Large and easy-to-read LCD screen includes simultaneous temperature reading.
  • Replaceable Sensor(model SP-C1).
  • Waterproof housing.


Manufacturer ID:
7.3 x 1.3 x 1.3 inches (18.5 x 3.4 x 3.4 cm)
EC Range:
0 - 9990 µS
TDS Range:
0 - 8560 ppm (mg/L)
Temperature Range:
0-80 °C; 32-176 °F
0-99: .1 µS; 100-999: 1 µS; 1000-9990: 10 µS
0-99: .1 ppm; 100-999: 1 ppm; 1000-9990: 10 ppm
.1 °C/F
+/- 2%
EC to TDS Conversion Factor:
Pre-programmed, non-linear conversions for KCl, 442 or NaCl solutions, selected by the user.
Temperature Compensation:
Automatic (ATC) with three temperature coefficients.
Digital calibration by push button.
Auto Shut-Off:
After 5 minutes.
Detachable, with platinum electrodes.
LCD panel
Waterproof (submersible); floats
Power Source:
3 x 1.5V button cell batteries (included), model LR44
Battery Life:
Approximately 100 hours of usage (high ranges use greater power consumption)
90.7g (3.2 oz) without case

- Meter is shipped with the default reading in EC using the KCl temperature coefficient and the temperature reading in Celsius.
- HM Digital TDS meters come factory calibrated and are ready to use. They are designed to stay consistent. However, after prolonged usage, it may help to recalibrate your meter using a commercial standard NaCl-based solution, which is approximately, 0.5 µS of conductivity.
- 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.
- Immerse the meter into the calibration solution. If the meter does not read within 2% of the calibration solution, adjust the reading by inserting a mini screwdriver (not included) into the trimmer pot (the hole on the back of the meter). Turn the trimmer clockwise to increase the reading and counterclockwise to decrease the reading. Note that the adjuster is very sensitive.
- Includes a cap, batteries and lanyard.

COM-100 Product Manual (pdf) 0.17 MB
COM100 Comparison Chart (pdf) 0.4 MB

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