the trutest teststrips test for: free chlorine/bromine, ph, and alkalinity. for use with the aquachek trutest digital test strip reader. bottles have a convenient flip top cap for easy dispensing. just dip a test strip in your pool or spa, insert the strip into the meter and get fast accurate results! to keep your pool at its best, test at each end a minimum of twice a week. tests for 3 important chemistries in seconds: free chlorine/bromine, ph, total alkalinity.