High Quality pH Tester-- Made of premium plastic shell, and sturdy, easy to use, no more traditional chemicals needed. Easy to Read-- Large screen displays test result on pH and chlorine level for easy and accurate reading. Convenient to carry-- and compact with a hole for convenient hanging, easy to carry. Water Quality Tester Application-- Specially designed for a family size pool or spa. The essential tool to quickly and accurately measure ph & chlorine is the most commonly used water for killing , algae and microorganisms. The perfect tool for keeping your pool or spa in a safe chlorine and ph range without chemicals or guesswork. Electric tester for ph and chlorine (Cl2) levels, used to routinely monitor ph and chlorine levels in pools, spas and water sources. When chlorine and ph levels from whack, it can cause diarrhea and ear and skin infections. A good chlorine and ph keeps bad at bay: if the ph is too high, the electricity killed by chlorine runs out. Chlorine can also be eaten up when large amounts of nitrogen (feces, urine, sunscreen or sweat) or other organic matter enter the pool. This is why testing for chlorine and ph is best all the time - she can change every day depending on pool use. Keeping your ph in the proper range is important to maintain the finish of your equipment and pool. Your chlorine dissolve faster at a low ph. High ph render chlorine ineffective. Power supply: 1 aa alkaline battery (1.5v) Colour:white+gray Material:plastic Size:A: 18 x 11.5cm Package Contents: 1 x ph and Cl2 probe tester 1 x English manual 1 x Sand Paper 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.