[Household necessities] The water pH tester monitors the water safety in your home. Water quality is crucial to the quality of life. It can be used as a swimming to know when a PH balance aquarium is needed. [Easy-to-use digital pH tester] The digital pH pen is pocket-sized, and the simple calibration process is easy to use. It is equipped with two pH calibration powders, which makes the process simple and convenient. [High-precision pH tester] provides accurate pH reading with an accuracy of 0.01 pH. (ATC) Automatic temperature compensation accurately determines that the pH is in the range of 32-176 degrees Fahrenheit. [Automatic temperature compensation] This pH meter can automatically adjust the water temperature, making it a perfect aquarium water tester and swimming pool tester. It monitors the pH up and down. [Ready for use] comes with a PH meter, a English user manual, two 1.5V LR44 button cell (built-in) and two PH buffer powders. This is all you need to start monitoring the pH up and down. Color: white, yellow material: plastic Package Contents: 2 x PH meter 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.