Hach® 2745650 pH Test Strips, pH Range 4-9
These pH test strips may be used for water testing in the lab or in the field. Most natural waters range from pH 4 to pH 9, but commonly are above pH 7 because of carbonates and bicarbonates (alkalinity). The pH of water used in industry, boiler feed water, and swimming pools usually is kept within a narrow range. Contains 50 tests.