Review on Bluelab pH Probe Care Kit for Hydroponic Systems and Indoor Plant Growing – Includes Calibration Supplies, Storage Solution, and Brush – Compatible with Pen, Meter, Monitor, Controller, and Tools – Clear by Tutcht Cobb

probe care kit is very nice and practical in the sense that it has everything you need and instructions. However, I think it is worth mentioning that this is not a necessary accessory for the bluelab pH meter, but rather a convenience item. The cleaning set basically consists of a soft toothbrush and a cleaning agent, which can be replaced with soap according to the instructions. It also comes with a pH calibration solution and a few other goodies, but not in large portions, so you'll probably be better off buying a few bottles of pH calibration solution in the long run.