Specification: Measure range: 0-14pH Resolution: 0.01pH Accuracy: 0.01pH Power supply: 2-1.5V LR44 battery Operating temperature: 0-60 Calibration: three points automatic calibration(only 6.86 point calibration: the accuracy is 0.1pH) Dimension: 6.10in*1.18in*0.72in Feature: Ensure your pool, general hydroponics pH or even drinking water has a perfect pH balance and safe for use with Tester precision pH accuracy. Tester has a sensitive electrode sensor to read accurate pH levels. The included detailed manual will show you how to get the best accurate and stable reading. pH meter has a built-in temperature sensor.When the temperature of the sample solution is different from that of the standard solution, the automatic temperature compensation system (ATC) adjusts the temperature to accurately measure 0C-80C (32F-176 F). Pocket Size pH Meter is the ideal test kit for home and laboratory uses. Ideal use to test for water, pools, aquariums, spas, hydroponics, food, wine and beer making and more. pH meter has an automatic calibration function that can be adjusted according to water temperature and quality, and the pH reading can be obtained by just waiting a few seconds in the testing. Calibrate the tester with one touch button CALusing Calibration Buffer Powder. How to use: 1.Take off the pen cover and clean the electrode with pure water. 2.Put the pen probe into the solution, taking care not to exceed the water level. 3.Turn on the switch, stir gently, and wait for the reading to stabilize. 4.After the reading is stable, read the displayed value. 5.After the test, clean the electrode with pure water, dry the water on the pen tip in time, and cover the pen cover back. Package Included: 1x pH meter 1x User manual 2x 1.5V LR44 button cells(build-in) 3x pH Buffer Powders