[4IN1 multi-function measurement]: use 4in1 PH Tester, you can accurately measure PH, TDS, EC and Temp values. Comprehensive water quality testing ensures that use healthy water. [Easy to use pH tester]: just immerse the electrode of pH meter into the target solution, and the reading is Stabilize, then read the data. clean the pH meter using it again Detect carefully to avoid affecting the reading. [High precision pH water tester]: You can quickly read the results by using a high sensitivity probe. This 4-inch pH meter has a wide measuring range and high resolution, ensuring that you can measure different kinds of liquids. [Automatic temperature compensation]: Through the accurate ATC of pH meter, the pH/TDS/EC/Temp function can accurately read the sample value in the wide temperature range of 32F-140F. It effectively solves the problem of inaccurate measurement caused by the change of liquid temperature. [Backlight display water quality tester]: The water quality tester adopts the advanced LCD backlight display design to make the reading easier and clearer. Data can be clearly seen even in the dark. [Multi-functional pH tester]: This digital version of pH tester can help you understand the water quality hydroponics facilities, garden soil, etc. of drinking water, bath water, a cup of salt water, swimming pool, etc. [Additional pH tester]: including 1 digital pH meter, 3 x 1.5V (LR44) button batteries and 3 pH calibration powder. Material: plastic Color: as shown Package Contents: 1 x water quality detector 3 packs of calibration powder 3 x button cell 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.