astroboy December 18, 2023 Share December 18, 2023 Any ideas on how reliable? I calibrated mine the best I could (calibration solutions 7.01 and 10.01) and it says my tank has a pH of 7.65, which is possible, I suppose, except that the vivosun pencil pH meter I have says it's 8.1, so a difference of 0.45. The vivosun gave readings on the calibration solutions of 7.2 and 10.2. I did the measurements/calibrations with two different sets of solutions. So, something is wrong. The solutions, which came in sealed packets, were three years old. Do those go bad after a while? Anyway, does anyone have an opinion on the American Marine meter? I used to have another one years ago and I never got measurements that I trusted. If the $15 pen meters work just as well I'm greatly tempted to toss it. Link to comment Share on other sites More sharing options...
zygote2k December 30, 2023 Share December 30, 2023 How old are the probes? calibrating with old probes can yield wildly varying results. American Marine ph meters have been around 35+ years. Link to comment Share on other sites More sharing options...
astroboy December 30, 2023 Author Share December 30, 2023 The probe is only a few weeks old. The meter itself where the probe connects to is very slightly corroded. I'll see if I can clean that up and it if makes a difference. I recalibrated with some brand new solution, it seems to be working OK for now.... Link to comment Share on other sites More sharing options...
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