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I did successfully test a 5y3gt at the time all of this happened. (I had the same thought, that this would check the tester) It uses the same circuit button "C" on the tester. This button worked on the 5y3gt test and gave me a good reading. I have not done anything at all to the tester to calibrate or restore it. It always seemed to work fine from the start. I will have to open it up and clean/inspect it. Thanks for the help.
Patrick
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