feature: Used to measure the PH value and temperature of the solution. Waterproof grade IP65, replaceable sensor probe. Automatic correction function. Suitable for water sources, aquariums, hydroponics, spas, swimming pools and other water systems. Various applications for testing the acidity and alkalinity levels of almost any liquid. Small and light pen design. Automatic shut-down. Easy to use and provides immediate results specification: Range: 0 ~ 14.00ph Resolution: 0.01ph; 0.1 C (0.2 F) Accuracy: 0.1ph; 1 C Working temperature: 0 50 (122 , 32 ) Temperature compensation: 0 c ++ 50 (32 f) Battery: 4 1.5V ( ag-13) button batteries (not included) Color: yellow Material: ABS Product size: 18.8 3.5 3.5cm / 7.4 1.4 1.4in Product weight: 73.7g / 2.6oz Packing size: 21 10.4 5cm / 8.3 4.1 1.9in