Critical tool for fast and accurate ph & chlorine readings; Ideal for keeping your pool or spa within the safe Chlorine and PH ranges; An electro-tester for testing pH and chlorine (Cl2) levels in water for routine monitoring of pH and chlorine levels of swimming pools, spas and different water sources; Recommended Chlorine Level for pool and spa: 2 to 1.7 ppm and 7.2 to 7.8 ph for PH Level for pool and spa; Light weight and easy to carry