• 50 6-in-1 test strips for pool and spa, presented in a convenient tube • Allow simultaneous analysis of total hardness, free chlorine, total chlorine, cyanuric acid, total alkalinity, and water pH • Provide fast and reliable results for water quality control in pools, hot tubs, and spas • Include a clear and easy-to-read color scale for accurate result evaluation • Laboratory tested to ensure measurement reliability • Easy to use: dip the strip in the water and compare with the color chart included on the bottle • Measurement range: total hardness 0-1000 ppm, free chlorine 0-10 ppm, total chlorine 0-10 ppm, cyanuric acid 0-240 ppm, total alkalinity 0-240 ppm, pH 6.2-9.0 • Ideal for regular maintenance of water quality in aquatic leisure facilities