Sofchek provides a reliable measure of water hardness in 15 seconds. Total Hardness is measured in the range of 0 to 25grains per gallon (0 - 425 parts per million). Sofchek Water Hardness Test Strips are packaged 50 to a bottle for professionals requiring a quick, reliable method of on-site testing. Sofchek Test Strips also come individually packaged in cases of 250 and 1000. The individually packaged strips are an excellent tool for promoting water conditioning equipment through direct mailings and consumer hand-outs. Sofchek Total Hardness Test Strips can increase the effectiveness of your in-home sales presentations and reduce time spent testing in the field.