Hanna Marine LR Nitrate Pocket CheckerThe HI 781 Nitrate Checker HC is a handheld colourimeter that uses the Beer Lambert principle to determine the concentration of nitrate colourimetrically. The HI 781 is designed specifically to measure low levels of nitrate in a saltwater aquarium. The 0. 00 to 5. 00 range is ideal for reef aquarium maintenance. The Checker HC handheld colourimeter is supplied with: Sample cuvette and cap (2) Marine Nitrate Low Range reagent starter kit (reagents for
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