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

Both worked fine until I calibrated the pH meter a week or two - I used the solution I had on hand and calibrated at 2 points, 7 and 4 - had to I am using the bags provided because the difference between the pH 7 solution I used and the pH 6.86 powder solution provided seems to be larger and an integer higher than just 0.14 - Human Error? Probably maybe, but I also have, brand new from first use, 200+ ppm as my tank corona, a pH temp gauge for continuous monitoring, which is a dot, on a TDS meter hooked up to this pH gauge - easy to use - I think that's your cheap money if you're patient and can calibrate both, probably a worthwhile buy - I wasn't expecting long term use of maybe 6 months before one of the probes broke anyway, it would have may be that if I had a calibrated pH meter with the correct solutions and 3 points it would be different - at this price don't be afraid to try again