This meter is completely useless. I ordered 1 and when it arrived the box said 'calibrated ready to use'. Regardless of the solution, it only showed 6.4 ph. I checked with my Blulab ph meter that the solutions are between 4.0 and 9.6. I sent the broken meter back and got a replacement. Guess what. Solutions. Even after performing the calibration according to the instructions, the meter only shows 6.3. This is rubbish, don't waste your time or money!
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