4 in 1 Water Quality Tester pH/EC/TDS/Temperature Meter IP55 Waterproof Automatic Shutdown Backlight Display Tester White PH-686 Features: - Quality Material: Made of quality ABS material, more . - Backlight Display: Easy to read and does not affect the use in the dark. - Easy Operation: One button to switch, more convenient. - Multiple Measurements: 4 in 1, pH/EC/TDS/Temperature Measurement. - Wide Application: Suitable for the measuring of drinking water, hydroponics, aquarium, swimming pool, laboratory, etc. Specifications: Material: ABS Color: Grey Power Supply: 3 * 1.5V AG-13 Battery (Not Included) Temperature Compensation: 0-50℃ Operating Temperature: 0-50℃ Measurement Range: pH: 0.00-14.00pH EC: 0-19990μs/cm, 0-19.9ms/cm TDS: 0-19990ppm, 0-19.9ppt Temperature: 0-50℃(32-122℉) Resolution:  pH: 0.01pH EC: 1μs/cm(<1999μs/cm), 10μs/cm(>1999μs/cm), 0.1ms/cm TDS: 1ppm(<1999ppm), 10ppm(>1999ppm), 0.1ppt Temperature: 0.1℃(0.2℉) Accuracy: pH: ±0.03pH EC/TDS: ±2%F.S Temperature: ±1.0℃ Item Size: Approx. 19*3.8*3.8cm / 7.48*1.5*1.5in Item Weight: Approx. 75g / 2.65oz Package Size: Approx. 25*10.5*5cm / 9.84*4.13*1.97in Package Weight: Approx. 150g / 5.29oz Note: Please read the Users Manual before use. Packing List: 1 * Digital Tester 1 * Screwdriver 1 * Users Manual(English)