Cool. Here is another site that has more info on it. You only need the 7.01 and it's one point calibration.

Milwaukee pH600 pH Tester, Meter, pH 600
LOC NAR on probation Reviewed by LOC NAR on probation on . Six Plant Rubbermaid DWC Hello everyone, I currently have a 3ft X 2ft X 6in tray that I use for ebb and flow with a 14 gallon reservoir underneath it. I built the system with rubbermaid containers, and did not put much consideration into complete drainage. The fill/drain fittings are right in the middle, causing a small layer of water to remain for most of the day, every day. In the future i will place the fittings on one end of the tray, and have the other end slightly elevated, to force all water to drain to one Rating: 5