Calibrating a cheap Chinese PH meter.

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These are the problems I had calibrating my ATC
PH meter. Do not try to use distilled water to calibrate to a 7.0 reading!
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Ive used these for over years.. For everyone saying chinese junk i challenge you to find a ph neter that isnt made in china lol and even if it isnt i can guarantee the parts were

ifeelallfidgetyandwarm
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could be that you rinsed the solutions in that distilled water, and then checked its ph. mabye try a completely seperate glass of distilled water

Dryandice
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