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Calibration Standard for HI 736 Checker HC ®
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Range 0 - 300 ppm in salt water | Colorimetric Method | Resolution 1 ppm
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Range 0.0 - 12.5 ppm | DPD Method | Resolution 0.1ppm
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Range 0.0 - 8.0 ppm | DPD method | Resolution 0.1ppm
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Range 0:00 to 2:50 ppm | USEPA Method 330.5 / DPD | Resolution 0.01ppm
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Range 0:00 to 2:50 ppm | ascorbic acid method | Resolution 0.01ppm
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Range 0.0 - 15 ppm | Molybdenum Blue Method | 0.1ppm resolution
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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.