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Price is justified from expiration date (December 2014) Thanks to the low cost and high precision, the Simplex water hardness measuring strips also save you time. The test can be completed in less than 1 minute. 50 strips per container. Great value for money. Sensitivity: 0, 40, 80, 120, 180, 250, 425, 1000 ppm (mg/L) or 0, 2, 5, 7, 11, 15, 25, 58 gpg A must have meter in every home.