Poolmaster 22212 Smart Test 6-Way Swimming Pool and Spa Water Chemistry Test Strips, 50 count For maintaining healthy water chemistry in swimming pool or spa Analyzes six chemical factors; free chlorine, bromine, alkalinity, pH, total chlorine and total hardness Free Chlorine/Total Chlorine /Bromine maintain sanitation, Alkalinity/pH measure the amount acidity, Test Total Hardness to help prevent formation of scale on hard surface pools Dip in water for instant reading; no-bleed pads give accurate color reading Comes in easy-to-store container; contains 50 strips per kit