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7 days ago

Blank not reading "0"

What could possibly cause my blank to not read zero?! I'm getting high and negative numbers. I got 3.113 thrn -. 20 etc... Up and down. Usually eventually I will get 0.00. Have not been able to get. I have to get blank of positive zero 0.00 mean before running standards. For an hour I was not able to get a positive zero The blank is distilled water!!
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