Wide range of applications: The digital PH pen is an ideal instrument for any aquarium, fishery, swimming pool, school laboratory, food and drink, etc. 2point automatic calibration, automatic identification of the standard solution, 5 seconds to complete the calibration.Easy to read: The sensitive sensor of the digital PH pen is in direct contact with the measured solution, which is fast and precise. A large LCD screen with excellent waterproof performance allows you to easily read the displayed value.Auto Calibration Function: The digital PH meter pen has an automatic calibration function of temperature. There is no need to worry about the influence of temperature changes on the pH value. The pH value will automatically adjust the temperature.Easy to use: The digital PH meter pen only needs to remove the protective cap, immerse the PH meter electrode in the solution and press the button to measure.This digital pen pH meter is an ideal instrument for any aquarium, fishing industry, swimming pools, school labs, food beverages, etc. It is very efficient and accurate thanks to its advanced automatic 2point calibration. Its pocket size allows you to take it everywhere.