Pentair 745000110 AcuCheck 3 Electronic Water Tester AcuCheck 3 electronic water tester Precise and easy hand held photo spectrometer testing and digital readout is extremely accurate Quick and easy, simply fill and insert a test tube, press a button, and you have your reading Everything you need for water testing is stored in a convenient compartment inside the AcuCheck 3 Four models available to customize testing are pH, chlorine, alkalinity; pH, chlorine, cyanuric acid; pH, chlorine, bromine; pH, bromine, alkalinity