Measuring range: 0.00-14.00PH Accuracy error: 0.01PH Resolution: 0.01PH Calibration method: 3-point automatic calibration Electrode: Glass Bubble PH meter 1 + 3 packs of calibration powder [Automatic Calibration]: This ph tester has a good self-adjustment function, which can automatically calibrate the value to save test time according to different liquids. [Get Accurate Data]: The PH tester uses high precision conversion technology to accurately test pH value of any liquid you want to test; this PH meter has a sensitive electrode sensor to ensure the accuracy of water quality testing. [Carry In Your Pocket]: This water quality tester is small-size and light-weight, which looks like a pen; no matter when you go out, you can carry with you easily. [Not Affected By Different Temperatures]: Thanks to the built-in automatic temperature compensation (ATC), the PH meter is well adapted to any temperature to obtain accurate PH values. [Wide Application]:The PH meter can be used in a variety of environments, such as drinking water, swimming pools, aquariums, spas, aquaculture, well water, food brewing, laboratory testing, etc.