HM Digital COM-80 PPM/EC/TDS Hydrotester

MSRP: $46.44
(You save $8.49 )
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COM-80: EC/TDS HydroTester Series

The COM-80 is easily the most advanced economically priced, reliable EC/TDS meter on the market. With its versatility and durability, it 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). Excellent for nutrient testing
  • Four scales: EC: µS, mS; TDS: ppm, 0.5 (NaCl) & 0.7 (442™)
  • Automatic Temperature Compensation (ATC)
  • Water resistant
  • 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.
  • Includes a protective cap and batteries


2 Reviews Hide Reviews Show Reviews

  • 3
    HM COM-80

    Posted by Gene on Aug 25th 2021

    The first meter I received was dead out of the box. The second one worked good. The problem with this meter is the small screen and not backlit, very difficult to see if working in other than good lighting. I also did not understand what the scales were for until I went on the internet. What I need to understand now is what are good readings for what I am growing. I did a control reading of just plain water I was using and then measured the Bloom liquid fertilizer limited to a 5 gallon bucket, then took more readings with the full 5/5gallon system taken from the reservoir bucket. I hope this is pretty clear. If not, please give me a call. I will be caling Gary again and purchasing a meter with a larger lighted readout. Gene 301-807-****

  • 5
    HM Digital COM-80

    Posted by Randall Barnett on Jul 3rd 2020

    Works great. No issues what so ever. Fast delivery.

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