Fast and Accurate - This highly accurate water tester delivers fast and accurate results. It features a sensitive electrode for precise pH measurements. The large display shows both pH and chlorine levels for easy reading. Easy to Read - Easily read pH and chlorine levels. No chemicals required, easy to use. Provides instant and accurate results. The recommended chlorine level for pools and spas is 1.2 to 1.7 ppm. The recommended pH level for pools and spas is 7.2 to 7.8. This tester saves you time and money. Tests pH and Cl - Ideal for easily testing the pH and Cl levels of water, without chemicals or hassle. Just a few steps. 1. Clean the probes as directed in the manual. 2. Turn the dial to the desired value. 3. Immerse the probes in the water until they reach the black plastic level. 4. Wait until the needle indicates the correct reading. Small and Portable - Compact, lightweight, and easy to carry. Ideal for travel, it fits easily in a travel bag or purse and can be used to test water quality during hotel stays. Travel safely. Requires one AA battery (not included). Widely used - Lightweight and compact, this pH meter is easy to carry. Ideal for pH testing at home and in laboratories, including aquariums, swimming pools, tap water, hydroponics, spas, laboratories, and scientific analysis.