The CL200 is an ExStik® chlorine meter. This breakthrough technology detects Direct Total Residual Chlorine levels ranging from 0.01ppm to 10ppm. Non-subjective readings are unaffected by interferences common to traditional colorimeters and spectrophotometers, such as sample color, turbidity, light, and contaminants. This kit includes an electrode, five packs of 10 reagent tablets (50 tests), a protective sensor lid, a sample cup with cap, four CR2032 batteries, and a 48" neck strap.