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EC meter µS and PPM


New Member
I have bought and tested my EC meter (HM Digital COM-80 EC/TDS HydroTester).
When I test my tap water it says something like 130µS, but the run off from my soil can be up to 800.
So I wonder what is normal readings and what should I aim for. I do understand that no one can tell me exact since every plant is different and abosorb nutrients at different pace.
So does anyone else use EC meters and measure in µS?
What does your readings say?

The youtube videos I have been looking at always talks about PPM, but after some reading im under the impression that EC with µS measurements would be more accurat.

Does µS equal ppm/2 ?


New Member
The spesification info
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. - Does this mean that 1µS equals 1ppm?
Temp. resolution: 0.1 °C/F
Accuracy: +/- 2%
EC-to-TDS Conversion Factor: NaCl (avg of 0.5). Or is it that 1µS equals 0.5ppm?
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)

Edit: Link to info site: http://www.tdsmeter.com/products/com80.html
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