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Osmotics Water Filters are fast becoming the leading brand within the water filtration industry. Our water filters and Reverse Osmosis systems improve water taste and quality by reducing impurities.
HM Digital COM-80: EC/TDS HydroTester
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75.00 Grams
Calculated at checkout
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Product Description

NEW! The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.



  • Measures electrical conductivity (EC), total dissolved solids (TDS). Exellent for nutrient testing.
  • Four scales: EC: µS, mS; TDS: ppm, ppt
  • Automatic Temperature Compensation (ATC)Water resistant
  • Water resistant
  • Measurement Range: 0-9990 µS; 0-5000 ppm; 0-9.9 mS; 0-5.0 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.
  • Factory Calibrated: The COM-80 meter is calibrated with a 1413 µS solution. The meter can be recalibrated with digital calibration using the push buttons.
  • Includes a protective cap and batteries.



  • Hydroponics and Gardening
  • Aquariums and Reefs
  • Pools and Spas
  • Water Treatment
  • Drinking Water
  • Much More!


  • EC Range: 0 - 9990 µS; 0 - 9.9 mS
  • TDS Range: 0 - 5000 ppm (mg/L); 0 - 5.0 ppt
  • Temperature Range: 1-80 °C; 33-176 °F
  • Resolution: 1 µS/ppm; 0.1 mS/ppt.
  • Temp. resolution: 0.1 °C/F
  • Accuracy: +/- 2%
  • EC-to-TDS Conversion Factor: NaCl (avg of 0.5).
  • Calibration: Digital calibration by push button.
  • Probe: Fixed
  • Housing: Water resistant
  • Power source: 3 x 1.5V button cell batteries (included) (model LR44 or equivalent)
  • Dimensions: 15.3 x 3.2 x 1.8 cm (6.0 x 1.3 x 0.7 inches)
  • Weight: 53.9g (1.9 oz)
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Product Reviews

  1. Excellent test meter - does exactly what it says on the tin! – Rating 5

    Posted by David Howard8th Mar 2015

    Wasn't sure whether this was what I needed so one cold, wet and miserable Sunday in February I sent an email asking for clarification of one or two points. I was very surprised to receive a reply within two hours with the answers to my queries - on a Sunday!! I ordered it and a few other items the same afternoon, they were dispatched the following day and I received them on the Tuesday morning. How's that for service. Will be using Osmotics in future.

  2. Impressed with the quality – Rating 5

    Posted by Mark Evenden1st Jan 2013

    Bought one of these a few months ago, use it every day - superb, really impressed with the features.

What is Reverse Osmosis?

Reverse osmosis (RO) is a filtration method that removes many types of large molecules and ions from solutions by applying pressure to the solution when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side.

Reverse osmosis is most commonly known for its use in drinking water purification from seawater, removing the salt and other substances from the water molecules.

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