Specification:Item Type: Pen Type PH Meter Material: ABS Battery Type: Built in 280mAh LR44 Button Battery (included) Measuring Range: 0.00 to 14.00ph Accuracy: 0.01pH Resolution: 0.01pH Package List:1 x Pen Type PH Meter 3 x PH Buffer Powder1 x User Manual Note:Ships with built in battery. High Accuracy: Pen type PH meter has built in temperature sensor, automatic temperature compensation system (ATC) adjusts the temperature, accurately measures 0C to 60C. Auto Calibration: The digital PH meter has an auto calibration function that adjusts according to the water temperature and water quality, and you only need to wait a few seconds during the test to get a PH reading. Small Portable: PH meter with ATC is small in size, light in weight, convenient to use when going out, and has a measuring range of 0.00 to 14.00pH. ABS Material: Water quality tester adopts ABS material, which is corrosion resistant and rust proof, with small error and high stability. Wide Application: The PH tester is ideal for use in swimming pools, aquariums, spas, hydroponics, food, wine and beer making and more. High Accuracy: Pen type PH meter has built in temperature sensor, automatic temperature compensation system (ATC) adjusts the temperature, accurately measures 0C to 60C. Auto Calibration: The digital PH meter has an auto calibration function that adjusts according to the water temperature and water quality, and you only need to wait a few seconds during the test to get a PH reading. Small Portable: PH meter with ATC is small in size, light in weight, convenient to use when going out, and has a measuring range of 0.00 to 14.00pH. ABS Material: Water quality tester adopts ABS material, which is corrosion resistant and rust proof, with small error and high stability. Wide Application: The PH tester is ideal for use in swimming pools, aquariums, spas, hydroponics, food, wine and beer making and more.