1、Function 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. 2、Wide 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. 3、Multifunctional 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. 4、Two Recording Modes: There are two recording modes for automatic storage (up to 2000 sets) and manual storage (up to 60 sets) with illumination data. 5、Good Features: Automatic range, sensitive response, capable of measuring low light environments. Can turn on screen backlight for easy operation in the dark room. 6、Turn 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). 1 x Illuminometer 1 x Storage Box 1 x Manual1 x USB Cable  Item Type: IlluminometerMaterial: Plastics, Silicon photodiodeWeight: Approx. 746g / 26.3ozBattery: 3 AAA Battery (Shipped Without Battery)Product Size: Approx. 145x70x30mm / 5.7x 2.8x 1.2inIllumination Probe: Silicon PhotodiodeIllumination Range: 0-20000LM (0-2000fc), Divided Into Four GearsRepeatability: ±2%Refresh Rate: 2 Times Per SecondHumidity Probe: NTC ThermistorHumidity Range: -20℃ ~ 50℃ (-4°F ~ 122°F)Humidity Accuracy: ± 1.0°CWorking Mode: Regular Mode, Setting ModeFunction Operation: On/Off Operation, Backlight Switch Operation, Measurement Of Maximum/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