Product Description: The PH-097 waterproof automatic calibration pH tester features a large screen displaying both acidity and temperature simultaneously, with an IP55 waterproof rating. All readings are automatically temperature compensated (ATC). The temperature sensor directly contacts the measured solution, ensuring accurate and rapid readings. It adopts a two-point (pH4.00, pH6.86) automatic calibration method. For calibration, simply place the instrument in the corresponding standard buffer solution and press the CAL (calibration key). The device will then automatically calibrate. Compared to pH meters with analog circuits, this function enables faster calibration, more accurate data, and simpler operation, eliminating the hassle of adjusting potentiometers and repeated verification required by other models. The device automatically powers off after 4 minutes of inactivity. Calibration solutions (liquid or powder) and various packaging options can be provided according to customer requirements.