Residual chlorine tester: high accuracy, stable and reliable performance. A very essential tool for swimming pool and spa, ideal for simple operations to test the PH and CL2 of water. Feature: High quality material, not easy to break and durable to to use. This digital pH meter features high accuracy, stable measurement, high reliability and excellent performance. QUALITY GUARANTEE: If your water quality meter is broken or you have a defect, please feel free to contact our customer service team, they will serve you with enthusiasm. EASY TO USE AND USE: Compact structure, lightweight and portable, easy to carry and convenient for outdoor use. indoors and outdoors. Easy to use and use, just insert the probe into the liquid and press the button to test the pH. LIGHTWEIGHT: Easy to use and read numbers, convenient to use. Lightweight and small in size, the portable water quality tester is portable to carry. Feature: 1. High precision performance, stable and reliable, small size, suitable for portable use. 2. The large screen displays the test result on the level of PH and chlorine for easy reading. 3. Easy to use and get results instantly and accurately, no chemical agents needed, easy to use water quality tester. 4. Lightweight and easy to carry, convenient to use, you can save time and money with this electro tester. Specification: Condition: 100% Brand New Item Type: Water Quality Tester. Material: PVC Color: As shown in the picture Weight: About 216g/7.6oz Uses: As a water quality detector Application: For aquaculture, swimming pool Power: 1 x AA battery (not included) ; Test the residual chlorine content: The recommended residual chlorine content for swimming pool water or hot spring water is 1.2 to 1.7 ppm A) Place the pointer at the set point position. B) Hold the tester in one hand and the test rod in the other. Insert the metal rod into the water until the black position. Take a reading after the pointer stops swinging. C) Leave the test rod in the water and continue pH testing as instructed. PH Test: The recommended pH for swimming pool water or hot spring water is 7.2 to 7.8 A) Let the test stick in the water and turn the knob towards the pH direction until it clicks (the battery should be removed when reading the pH value). B) Wait for the pH reading after the pointer stops swinging. D) Gently dry the test rod, insert it into the slot near the tester and store it. the Package List: 1 x Water Quality Tester 1 x Instruction Manual"