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Total hardness water quality test strips evaluate calcium levels in residential, industrial, or educational applications Tests from 0 to 1,000 ppm with sensitivity indicators at 0, 40, 80, 120, 180, 250, 425, and 1,000 ppm (mg/L) or 0, 2, 5, 7, 11, 15, 25, and 58 gpg Three-second test time for immediate results