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Calibration Standard for HI 715 Checker HC ®
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The HI 761 uses an adaptation of the USEPA method 330.5. The reaction between the chlorine and DPD reagent causes a pink tint in the sample.
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Reagents for HI 755 Checker HC ®, 25 Tests
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Range 0.0 - 8.0 ppm | DPD method | Resolution 0.1ppm
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Range 0 - 200 ppb | ascorbic acid method | Resolution 1 ppb