The Pool check test 5 in 1 (important indicators) in swimming pools is ideal for checking the water, the quality of the pool water as well as the measurement of chlorine in water. Measures the following important indicators: Free Chlorine: 0, 0.5, 1, 3, 5, 10 ppm (mg / L), Total Chlorine / Bromine: 0, 0.5, 1, 3, 5, 10 ppm (mg / L), Total Acidity: 0, 40, 80, 120, 180, 240 ppm (mg / L), pH: 6.0, 6.8, 7.2, 7.6, 8.2, 9.0, Total Hardness: 0, 50, 120, 200, 400, 1000 ppm (mg / L).