Calibration Standard for HI 726 Checker HC ®
All Product
Range 0:00 to 2:00 ppm | EPA method 340.1 | 0.01ppm resolution
All Product
Range 0.0 - 15 ppm | Molybdenum Blue Method | 0.1ppm resolution
All Product
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.
All Product
Range 0-999 ppb | ASTM Method D1687-92 diphenylcarbonate | Resolution 1 ppb
All Product
Range 0.0 - 8.0 ppm | DPD method | Resolution 0.1ppm
All Product
Range 0 - 200 ppb | ascorbic acid method | Resolution 1 ppb
All Product
Range 0:00 to 5:00 ppm | EPA Method 315 B | 0.01ppm resolution
All Product
Range 0:00 to 2:50 ppm | USEPA Method 330.5 / DPD | Resolution 0.01ppm
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HI717 Checker HC ® - Phosphate, HR 
HI770 Checker HC ® - Silica, HR 
HI775 Checker HC ® - Alkalinity in fresh water (dKH) 
