Hanna Checker Instructions for Phosphate LR Standards:

1. 1. Thoroughly wipe standard cuvette with HI731318 lint free cloth and only handle using top of cuvette. The cuvette wall must be dry and free of smudges.
2. 2. Open B, HI713-11 standard cuvette and add 1 packet of HI713-25 reagent using procedure from the instructions (including timing).
3. 3. At the C.1 prompt, place A, HI713-11 into the holder of the Checker and press operations button.
4. 4. At the C.2 prompt, place B, HI713-11 standard cuvette as prepared above into the holder of the Checker and press operations button.
5. Acceptable results must be between 0.92 and 1.08 ppm at 25°C
6. *Attention: 1.00 ppm standard cuvette can be used only once.