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Hi. Today, I found out that if you have the Hanna Phosphorus ULR checker off and you keep the button pressed (instead of just clicking it), I get a series of codes. I got: 736, 1.05, -01. I guess they are some kind of troubleshooting or self-test values. Can others try it and share their values? Anybody knows what they mean? Have you seen documentation referring to this? Just did the same with my Hanna Alkalinity (dKH) tester (hold the button when off) and I got the following codes: 772, 1.07.