Make sure your pool is ready for summer with this Portable Pool PH Chlorine Level Tester This device tests your pool's chlorine and PH levels, plus it tells you if they're safe. Simply dip the probe in the water - long extension cord makes it easy to measure with Portable design means you don't have to worry about plugging into the mains Features a PH to CL2 conversion button Requires 1x AA battery (not included) See if it's safe to swim in with this Portable Pool PH Chlorine Level Tester - save 45%