Review on DigiGrow: Advanced Digital Tester for Enhancing Aquatic Environments in Aquariums and Hydroponics by Phillip Jaylon

The pH pen in this kit is junk. At first it got stuck reading all zeros. After playing around with it for a while it seems to be behaving normally, I did the calibration at 4.01 and 6.86. Then I tested some distilled water and the meter read 8.0 at first, after 1 minute it read 6.5 and after about 2 minutes it read 6. I bought another one of those yellow pH pens and after the same calibrations it gave the reading just jumped out. Everywhere, everywhere, everywhere. The TDS test pen appears to be working, with some slightly erratic readings, although I don't have anything to benchmark it against. The temperature readings were stable and seemed correct.