The swimming pool pH and Cl tester is used for approximate measurement of chlorine and pH in the water in your garden swimming pool. The swimming pool tester measures pH between 5.5 – 9.00 ppm and chlorine between 0.2 – 3.0 ppm. The tester is an indispensable accessory for your swimming pool for maintaining water quality, is very easy to use, including the measurement probe. Powered by one AA 1.5 V alkaline battery. Comes in a blister.