The basic tool for measuring ph & chlorine quickly and accurately is the most commonly used water disinfectant for killing , algae and microorganisms. The Perfect tool for keeping a pool or spa in a safe chlorine and pH range, without chemicals or guesswork. An electrical tester for ph and chlorine (Cl2) levels for routine monitoring of pH and chlorine levels in swimming pools, spas and water sources. When chlorine and pH are from whack, it can cause diarrhea and infection of the ear and skin. A good chlorine and pH keep in the bay: if the pH is too high, the electricity killed by chlorine will be exhausted. When a amount of nitrogen (excreta, urine, sunscreen or sweat) or other organic matter enters the pool, chlorine is also eaten. That's why testing chlorine and pH is the best all the time - she can change every day depending on the use of the pool. Keeping your pH within the proper range is important to keep the surface of the equipment and swimming pools. Your chlorine will dissolve faster at low pH. A high ph value will invalidate the chlorine.Accurate water measurement, care for the whole family's water health. Features: 1. Made of premium shell, durable and sturdy. 2. Easy to operate, no more chemicals need. 3. A convenient tool to test water pH and chlorine level for swimming pool and spa. 4. screen displays the test result on pH and chlorine level for easy and accurate reading. 5. Light weight and compact, easy to carry. With a hole for convenient hanging. Specifications: Tester size: 190x 20mm Total length of probe: 150mm Probe length: 48mm Cable: 300mm Power Supply: 1 x 1.5V AA Batteries(not included) Material: ABS colour: white+grey Package Contents: 1 x Water quality tester (without 1 x 1.5V batteries) 1 x English instructions Only the above package content, other products are not included. Note: Light reflection 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.