Hanna Checker Calibration

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ihave one same as in the video but the reading is not stable the digits keep changing too much.. what is the problem..

wisamism
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the hanna site tells you not to wipe the glass probe

NONVIOLENTEXTREMIST
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Indeed nice and easy. But do you have any video for the new HI98100 which does not have any calibration screws? It is probably easier. And how do you actually do the test on a sample of tank water? I know I sound like a dodo but I need some help. Probably I will check with my friend who is a chemistry professor.

SudiptoKolkata
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so is the calibration stuff a liquid or a powder?

Bennuides