Wanted to buy an EC to match my trusty PH20 so I bought an EC20. At first I was disappointed, the readings continued to drift even after calibration. Read the instructions and it is recommended to leave the probe in the calibration solution for 10-15 minutes if it has not been used for a long time. Did that, did a 2 point calibration and everything works great. I have used it daily for 8 days since then and it has stayed within the size specification. I would recommend it simply because the EC20 is just as reliable as my PH20 which I have had for over a year and has the same build quality.
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