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Hanna Checker Instructions for Marine Alkalinity Standards:
1. Thoroughly wipe standard cuvette with HI731318 lint free cloth and only handle using top of a cuvette. The cuvette wall must be dry and free of smudges.
2. At the C.1 prompt, place A, HI772-11 standard cuvette into the holder of the Checker and press the button.
3. At the C.2 prompt, place B, HI772-11 standard cuvette into the holder of the Checker and press the button.
4. Compare readings to the certificate of analysis for calibration reference.
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Easy to use By John on 4/9/2017John would recommend this product to a friendI got this product to check my Hanna PO4 checker... I got a result of 11.1 with a liquid test kit and ny checker showed a KH of 9.8... somebody was lying. So the Hanna control sample arrived which has a confirmed Kh of 5.0. I tested it in the checker and it registered 5.1... pretty impressive. So now I'm trusting that vs the liquid test (PS.. The liquid test kit had expiration date of 2018 btw so it was new)