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3) Calcium Hardness : 5-100 mg/L (ppm) as CaCO3 Drop titration 7) Nitrate : 0.0 - 50.0 mg/L (ppm) as NO3-N Comparator 4) Silica : 0.0-80.0 mg/L (ppm) as SiO2 Comparator 8)Nitrite : 0.0-0.8 mg/L (ppm) as NaNO2 Comparator — HiMedia WT083-1NO | Valence Scientific