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I cannot get my Apex PH probe to calibrate. I’ve used PH testers before... that had to be calibrated. So I have a question.
Am I supposed to remove the plastic tip cover on the probe? My last tester had a similar cap, but it was just to keep the probe head wet...
Am I supposed to remove the plastic tip cover on the probe? My last tester had a similar cap, but it was just to keep the probe head wet...