Accuracy: The meter can get results quickly and accurately without using color charts or messy test strips. It has a resolution of 0.01, an accuracy of 0.05, can be fully measured in the pH range of 0-14, and the pH meter has been factory calibrated. Chlorine content within the safe measuring range: 1.2-1.7 ppm, pH within the safe measuring range: 7.2-7.8. Convenient miniature: The handheld pen and compact travel case can be placed in a pocket or bag and can be carried anywhere. Since the pH meter has built-in automatic temperature compensation (ATC), you don't have to worry about the temperature of the test liquid, so it can accurately determine the pH of the sample at any temperature within the range of 0 Celsius -80 Celsius (32 Fahrenheit-176 Fahrenheit), very convenient. Practical safety: Recommended chlorine content in swimming pools and spas: The pH value in swimming pools and spas is 1.2-1.7 ppm and the pH is 7.2-7.8ph. The digital water quality monitor is an indispensable tool for quickly and accurately reading pH and chlorine, which can ensure that your pool/spa water is safe, comfortable and not . Wide application: This pH meter is very suitable for various tasks, such as swimming pool, water, home brewing, laboratory tests, aquarium maintenance, etc. Electrical tester for testing pH and chlorine (Cl2) levels in water. It is used to regularly monitor the pH and chlorine content of swimming pools, spas and various water sources. pH test: The recommended chlorine content for pool water or hot spring water is 7.2-7.8. A) When the probe is in the water, turn the dial to pH until it clicks. (The battery must be removed when reading pH). B) Wait until the pointer stops swinging and reads the pH. C) Gently wipe the test strip, insert it into the slot next to the tester and store it. Material: Plastic Color: White Dimensions (Height x Width x Depth): 17.5 x 12 cm / 6.9 x 4.7 inches Cable length: 72 cm / 28.3 inches Type: Water quality tester Battery: 1 AA battery (not included) Test Chlorine content: Recommended chlorine content for pool or hot spring water is 1.2-1.7 ppm. A) Turn the pointer to the \"Adjustment Point\" position. B) Hold the tester in one hand, place the test stick in the other hand and insert the metal rod into the water to the black position. Wait until the pointer stops swinging and read. C) Leave the test rod in the water and continue the pH test as instructed. Storage method: 1. When not in use, turn the knob to the off position (towards PH until it cannot move). 2. Store in a cool, dry place, avoid direct sunlight. 3. Never immerse the stick in any liquid other than swimming pools and hot spring water. 4. Check the battery charge status regularly. The tester uses a 1.5V \"AA\" alkaline battery. Includes: 1 x Water Test Kits 1 x User Manual Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The allowed measurement error is +/- 1-3 cm.