| Sensafe (481108) Total Hardness; 30 Test Strips |
 With the Total Hardness Test Strips, you can teach chemistry principles in a fun and safe way without expensive and complicated equipment! Test the calcium and magnesium levels of drinking water throughout your neighborhood and quickly gather data with an easy, one dip procedure. Number of Tests: 30 Strips Sensitivity: 0, 40, 80, 120, 180, 250, 425, 1000 ppm (mg/L) OR 0, 2, 5, 7, 11, 15, 25, 58 gpg Test Time: 30 seconds Price: 9.41 |