your pH meter might be broken if ...
Took my pH meter off the shelf today and noticed it was ready 4.2, not 7.0 as expected. Hmm. So I cleaned all the oxidation off the contacts down to shiny metal and stuck it in a box of lime for an hour. It's still reading 4.2, but in the garbage bin. I guess for $10, lasting 7 years wasn't too bad.
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