[Accurate and Reliable]Equipped with premium quality sensitive probe, water quality tester enables quick and convenient test. Put the probe into water and LCD shows accurate s in seconds. [Automatic Calibration]It needs to be recalibrated after a long period of inactivity or frequent use. The auto calibration function allows you to calibrate the pH meter easily. Just use the buffer powder and the "CAL" button to calibrate. [Backlit Display]The water quality tester uses an advanced LCD backlight display design, making readings easier and clearer. The data can be viewed clearly in the dark. [Portable Design]Handheld pen style conveniently fits in your pocket or bag and goes anywhere. [Wide Application]Digital pH meters are perfect for home and laboratory testing. pH pen can test pH and is perfect for multiple scenarios perfect for testing water, swimming pools, aquariums, spas, hydroponics, wine and beer. Specifications: Color: white blue Material: ABS Range: pH: 0.00-14.00pH Temp: 0℃-50℃(32℉-122℉) Resolution: pH: 0.01pH Temp: 0.1℃(0.2℉) Accuracy: pH: ±0.03pH Temp: ±1.0℃ Battery: 6V (Not included) Temperature Compensation: 0℃-50℃ Operating Temperature: 0℃-50℃ Item Size: 180 x 40 x 17mm / 7.09 x 1.57 x 0.67in Package Contents: 1x Water Quality Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.