Ricky, mine did the same thing this spring at just at about one year of use. Readings jumped all over even after cleaning and calibrating. I notice two tiny bare silver wires that look like they should lay along the glass bulb that are sticking out 90 degrees to it. I think those are what went bad on mine.
I have the BlueLab Guardian in line monitor now and love it. I don't think I'd go back to Hanna if I ever needed a new handheld again.
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