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 0:00 to 2:50 ppm | USEPA Method 330.5 / DPD | Resolution 0.01ppm
All Product
Range 0-999 ppb | ASTM Method D1687-92 diphenylcarbonate | Resolution 1 ppb
All Product
Range 0 - 150 ppm | ferrous sulfate method | Resolution 1ppm
All Product
Range 0 - 300 ppm in salt water | Colorimetric Method | Resolution 1 ppm
All Product
The HI 764 Checker®HC is extremely simple to use. First, zero the instrument with your water sample. Next, add the reagent. Last, place the vial into the HI 764 Checker®HC, press the button and read the results. It’s that easy.
All Product
Range 0.0 - 12.5 ppm | DPD Method | Resolution 0.1ppm
All Product
Range 0 - 200 ppb | ascorbic acid method | Resolution 1 ppb
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HI770 Checker HC ® - Silica, HR 
HI775 Checker HC ® - Alkalinity in fresh water (dKH) 
HI706 Checker HC ® - Phosphorous, HR 
