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- Tests for Total Hardness to determine calcium level present; result under 10 seconds; 50 pcs per bottle (pack of 6 bottles)
- Range - Method A: 0, 40, 80, 120, 180, 250, 425, 1000 ppm (mg/L) and Method B: 0, 2, 5, 7, 11, 15, 25, 58 gpg