Can measure pH, ORP, ISE and temperature, with unique CAL Check? Function, allowing users to query the power status at any time; Built-in temperature sensor titanium electric body acidity pH electricity, automatic temperature compensation, GLP data query function, including date, time, calibration values, slope and offset (pH), built-in seven standard acidity calibration points and five custom acidity calibration points and up to five automatic identification calibration, user custom set calibration time, calibration time expiration, timely remind the user; New design, strong and durable, in line with IP67 standard waterproof standard (prevent dust and water immersion), background light design, convenient for users to easily query and record the measurement results in the case of insufficient light, making the operation of the tester easier, for professional research and production to provide accurate measurement results.