PH CL2 Chlorine Tester Essential tool for quick and accurate measurements of pH & Chlorine as Chlorine is the most commonly used disinfectant for water by killing , algae and microorganisms. An Perfect tool for keeping your pool or spa within the safe Chlorine and PH ranges, no chemicals or guesswork. An electro-tester for testing pH and chlorine (Cl2) levels in water for routine monitoring of pH and chlorine levels in swimming pools, spas and water sources. When chlorine and pH levels go whack, it can lead to diarrhea and ear and skin infections. A good chlorine & pH level keeps bad at bay: If pH goes up too high, chlorine's germ-killing power drains. Chlorine can also get eaten up if a lot of nitrogen (from debris, pee, sunscreen, or sweat) or other organic gets into the pool. That's why it's best to test chlorine and pH levels all the time - they can change based on day to day pool use. Keeping your pH levels within the correct range is important for keeping your equipment and pool finishes intact. Your chlorine will dissolve faster with a low pH level. High pH levels render chlorine inactive. Save time and money with this electro tester. NOTE: Do NOT immerse probes in any liquid other than pool or spa water. Recommended chlorine level for pools and spas is 1.2 to 1.7ppm Recommended pH level for pools and spas is 7.2 to 7.8 Main unit: 190x120mm Probe with handle: 150mm long Probe (only): 48mm long Cable (only): 130mm long Power Supply: 1 x AA Alkaline Battery (1.5 V)(without battery) colour: gray + white Material: ABS Package Contents: 1 x pH and Cl2 Tester with Probe 1 x English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.