Review on 📏 Precision Calibration for Hydroponic Systems and Aquariums by Tim Hull

EC meter "looked good" but then I tried to calibrate the PH meter, written instructions are not something you can do can follow. The image in the ad shows a different procedure. I burned a gallon of PH 7 water previously tested on an expensive setup. The instrument finds the PH of the test solution, but when you put it back into the same solution, you get a completely different number, and in a few seconds it fluctuates as an integer from 6.86 to 7.5, the same for other solutions . The comments claim that this updated installation comes with 6 test packages, it had 3 and I used a few more of my own. You cannot trust the device or the technical support for this product. Do not buy.