As another reviewer has noted here, the positive reviews listed here do not refer to the pH meter but on a thermometer. The PH meter is the way of total scrap to put it straight away! To be fair, I would say that this device has the first 4 weeks to work and has set a day to the next his work. When in hold in distilled water has played it short crazy by all the possible numbers from 0.1 to 19.9 lit up and then distilled water had a pH of 12.4 to 19.9 swaying. And then the small screwdriver to which the plastic slot, with which you should calibrate the instrument allegedly can equal deformed to unfamiliarity. If I had no money spent I would have referred to it as a joke. What can I say, the cheap first impression proved to be true. And I do not even know whether the measured values during the first four weeks had been at all correct, I doubt it very much!
