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Calibration Standard for HI 701 Checker HC ®
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Range 0 - 600 ppb NO2-N | EPA method 354.1 | Resolution 1 ppb
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Range: 0 to 300 ppb. The HI 749 Checker®HC is a simple, accurate, and cost effective way to measure low ranges of chromium VI in fresh water. Designed as a more accurate alternative to chemical test kits, the HI 749 provides quick, accurate results in four easy steps. The HI 749 uses an adaptation of the ASTM Manual of Water and Environmental Technology, D1687-92, Diphenylcarbohydrazide method. The reaction between chromium VI and the reagent causes a purple tint in the sample.
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Range 0:00 to 2:00 ppm | ASTM D859 Method | 0.01ppm resolution
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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.
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Range 0 - 150 ppm | ferrous sulfate method | Resolution 1ppm
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Range 0.0 - 8.0 ppm | DPD method | Resolution 0.1ppm
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Range 0:00 to 3:00 ppm NH3-N | Nessler Method | 0.01ppm resolution