My first pH meter was a Hanna, and it only lasted about a year. I replaced it with an Omega, and it didn’t last much longer. They both had the same problem. The digital readout would not equilibrate - it bounced all over the spectrum. I was reluctant to buy a third meter, or replacement probes, so out of desperation I just let them soak in water for several days. Both meters had a rubber cap to cover the probe while not in use, and I always put water in the cap prior to closing. I reasoned that perhaps the probe was just not staying wet enough. Well, after several days, the Omega started to work normally again. And after a week the Hanna also started working. This after it had been on the shelf unused for over 2 years. So, if your meter starts doing a jig, be patient and give it some hydro therapy.
Also, from now on, I intend to cap the meter while it is under water to hopefully keep more hydration against the probe’s surface. Maybe that will help.
