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Don't consider .1 a big diff with regard to the Hanna readings. I've often seen a .1 or even .2 difference when doing tests back to back. Many reasons this could occur, all have to do with testing errors. Slight volume diff in the plunger and/or water volume, or dirty testing vial.
As for the 3 min count down, never heard of this nor is it depicted in the Hanna instructions nor videos.
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90g Mixed Reef
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