1Function Operation: on off operation, backlight switch operation, measurement of maximum and minimum illuminance and humidity values, measurement of illuminance difference, data retention, integration operation, manual storage operation, manual storage record query, manual storage record deletion, automatic storage operation, automatic storage record query, automatic storage record deletion, illuminance and humidity unit selection, timed shutdown on off setting, Bluetooth on off setting. 2Wide Application: Used for light intensity measurement engineering, quality control, healthcare, and light intensity measurement in various environments such as factories, schools, offices, transportation, and homes. 3Multifunctional Illuminometer: The illuminometer can not only measure the current, maximum, minimum, and difference values of illuminance and temperature, but also store illuminance and temperature data, measure and statistics illuminance integration, integral averaging, and data recording functions. 4Two Recording Modes: There are two recording modes for automatic storage (up to 2000 sets) and manual storage (up to 60 sets) with illumination data. 5Good Features: Automatic range, sensitive response, capable of measuring low light environments. Can turn on screen backlight for easy operation in the dark room. 6Turn On Off: The light meter can be turned on for a long time, and can be automatically turned off without operation (default 10 minutes, settable).