Bestway - Pool and Spa Test Strips Indicators to test the water Bestway 58142 - a special testers that determine not only the quality of the water in the pool, but also the content of bromine, active oxygen, chlorine, and other indicators. With the help of these devices, you can ensure the safety of your child when he is in the water. Features: - The ideal solution for basic pool and spa water testing - Easy Colour -Match System contains 50 test strips - 1 Year Shelf Life - 3-in-1 Test strips -Free Chlorine-pH-Total Alkalinity - Measure Free Chlorine 0 to 10 ppm, Alkalinity 0 to 240 ppm and pH 6.2 to 8.4 with instant results - Blister card Specifications: - Weight: 0.04kg - Dimensions: 4.2 x 9.5 x 16cm