1、With 2-point automatic calibration, you only need to put the instrument in standard buffer and press CAL (calibration button), the instrument will start automatic calibration. 2、Large screen display, the reading is clearer and more intuitive, stable value of 4-5 seconds, economical, fully suitable for the needs of acid and alkali testing in various industries. 3、All readings are subjected to automatic temperature compensation (AC). The temperature sensor directly contacts the tested solution, making the reading truss accurate and fast (the pH pen electrode is fragile, please do not touch). 4、Small size, lightweight and portable to carry it with you. 5、Suitable for testing pH balance of drinking water, pool, aquarium, RO system, Spa, or hydroponics. 1 x PH Value Mete Net weight: 48 grams Size: 155*29*16mm Working temperature: 0-80 °C Electrode: glass bubble Temperature compensation: ATC automatic temperature compensation Battery: 2* 1.5 V button batteries (not included) Calibration: 2-point automatic calibration Application: swimming pool, water laboratory, disease control center, aquaculture, hospital, domestic water, drinking water, aquarium, water treatment company, etc.