This gray-white, plastic and metal digital tester (approx. 18 x 11.6 x 3.1cm, 220g) offers a convenient, chemical-free way to measure pH and chlorine levels in pools and spas. It requires one 1.5V AA battery (not included). The large screen provides easy-to-read results. Recommended chlorine levels are 1.2-1.7ppm, and recommended pH levels are 7.2-7.8pH. It's lightweight, compact, portable, and features a hanging hole.