Check the listing for details. AquaChek Silver 7 in 1 Pool Spa Water Test Chlorine Strips 100 CT 551236 (7-Way). Color: Silver, Condition: New. Listed at 24.44 USD. AquaChek Silver 7 in 1 Pool Spa Water Test Chlorine Strips 100 CT 551236 (7-Way) AquaChek Silver 7-Way - 100 Strips Easy, quick, safe and accurate testing of the chemical makeup of your pool. The AquaChek Silver 7-Way Test Strips tests for total hardness, total chlorine, total bromine, free chlorine, pH, total alkalinity, and cyanuric acid (stabilizer). 7-Way Strips Measure:Free Chlorine, Total Chlorine, Bromine, Total Hardness, Total Alkalinity, pH and Cyanuric Acid Just dip and wait 15 seconds Includes a reusable color chart comparator( The reusable color chart comparator is the color chart on the side of the bottle)NOTE All Bottles are NEW and kept in a dry environment to keep FRESH and have manufactures expiration date codes of 1-2 years on each bottle. We ONLY carry new fresh product in stock. Multiple qty orders purchased will all have the same and current date codes sent out to you. Tests For:Total Hardness: 0-1,000 ppmTotal Chlorine: 0-10 ppmTotal Bromine: 0-20 ppmFree Chlorine: 0-20 ppmpH: 6.2-8.4Total Alkalinity: 0-240 ppmStabilizer (Cyanuric Acid): 0-300 ppmAquaChek Silver 7 in 1 Pool Spa Water Test Chlorine Strips 100 CT 551236 (7-Way) AquaChek Silver 7-Way - 100 Strips Easy, quick, safe and accurate testing of the chemical makeup of your pool. The AquaChek Silver 7-Way Test Strips tests for total hardness, total chlorine, total bromine, free chlorine, pH, total alkalinity, and cyanuric acid (stabilizer). 7-Way Strips Measure:Free Chlorine, Total Chlorine, Bromine, Total Hardness, Total Alkalinity, pH and Cyanuric Acid Just dip and wait 15 seconds Includes a reusable color chart comparator( The reusable color chart comparator is the color chart on the side of the bottle)NOTE All Bottles are NEW and kept in a dry environment to keep FRESH and have manufactures expiration date codes of 1-2 years on each bottle. We ONLY carry new fresh product in stock. Multiple qty orders purchased will all have the same and current date codes sent out to you. Tests For:Total Hardness: 0-1,000 ppmTotal Chlorine: 0-10 ppmTotal Bromine: 0-20 ppmFree Chlorine: 0-20 ppmpH: 6.2-8.4Total Alkalinity: 0-240 ppmStabilizer (Cyanuric Acid): 0-300 ppm