Usage :Test pH, for example body fluid, saliva and so on Application :swimming pool chenicals ,Lab and so on Scope:pH 4.5-9.0 Precise test strips for PHMain Usage: test pH, for example body fluid, saliva and so on.Test scope and precision : pH 4.5-9.0 (4.5, 5.0, 5.5, 5.75, 6.0, 6.25, 6.5, 6.75, 7.0, 7.25, 7.5, 8.0, 8.5, 9.0 ) pool PH test strips