Features: The mini size ph meter we designed allows you to easily put it in your pocket, so you can take measurements anytime, anywhere. It can help you test whether you take it to the pool, on a trip, to the beach or camping. As a tool to improve the life quality . Can be used to test drinking water, swimming pools, PH balance in aquarium, spa or hydroponics. PH meter could measure pH value. 0.01 high accuracy, full measurement range of pH 0 - 14, reliable and quick readings. Lock function makes it easy to read and record. With LCD display, and the pH results can be simultaneously showed on the LCD screen. Ensure your drinking water,pool, PH pen has a perfect pH balance and safe for use with precision-pH accuracy PH tester. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Range : 0-14 Accuracy: ±0.02 Resolution:0.01 Battery: LR441.5V*2 Backlight: No Powered Supply: Use 2 LR44 button batteries Package List: 1X Portable High-precision PH Test Pen