Multi-parameter test strips, 50 pcs

5-in-1 test strips for quick, on-site evaluations of free & total chlorine, range 0-10mg/L, in steps 0, 0.5, 1.0, 2.0, 10; total hardness as CaCO₃, range 0-25mg/L, in steps 0, 1.5, 3, 7, 15, 25; total alkalinity as CaCO₃, range 0-240mg/L, in steps 0, 40, 80, 120, 180, 240; and pH, range 6.2-8.4, in steps 6.2, 6.8, 7.2, 7.8, 8.4.