I have a Eco Tester pH 2 meter that I have had for around 8 months now and everything has always been perfect with it. I even calibrated it at least once every 2 months. But for the last month or so now I have been without the storage solution and have been using tap water. Now for the last couple weeks I noticed it started to run higher then normal so today I bought some calibration solution to recalibrate it but when I turned it on it read 10.5 and would not drop below 10.0. I knew something was wrong right then so I grabbed my cleaning solutions and did that still read 10.0 so then I recalibrated it by dipping it into 7.01 solution and yet again would not drop below 10.0. I even reset the meter but to no avail. My question GC is this, Did storing my meter in tap water ruin it? Or is it just a faulty meter?