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I have one of these, but I lost the instructions. Can anyone explain how to use it>? I believe its very similar to the kh test kit as in: put a drop of solution to 5ml of water, flip it covered, and keep doing so until it turns from blue to yellow, and however many drops it took would be your kh.
 

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One drop to start.

Then start counting drop +shaking until it turns green.

I hope this helps.

Nick
 

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I initially got an AP kit that has expired. It never turned green no matter how many drops I use. The second kit worked ok.
 
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