1、Large‑capacity automatic storage and memory function, with automatic storage of illuminance data (maximum 1900 groups), by default, it is stored once per second. 2、Lightweight and portable, light weight, small size, more convenient transportation, easy to carry out to measure strong and weak light. 3、The 0.1LX high accuracy illuminance meter, scientific design makes the test easier, and you can get results quickly. 4、Data retention makes debugging more convenient, and there is no need to worry about data loss. And the data mining function has been tested and can be used with confidence. 5、Convenient to use, with PC analysis software, easy to use, can export text curve graphic analysis, and print test data. 1 x Illuminance Meter 1 x Plastic Storage Box1 x USB Data Cable1 x Manual  Item Type: LuxmeterMaterial: PlasticWeight: Approx. 694g / 24.5ozProduct Size: Approx. 14.5x5cm / 5.7x 2.0inMeasuring Range: 200000LxMeasurement Error: <10000Lx error ±3% >10000Lx error ±4%Sampling Rate: 2 times/secPhotometric Probe: Silicon diodeTemperature Probe: NTC thermistorTemperature Range: 0~40℃Temperature error: ±1℃Unit conversion: Lx/FcData storage: 1900 groupsWorking Temperature: 0~40℃USB line voltage: 5VProduct Power Supply: 2xAAA batteries (delivered without batteries)Illumination data storage, query and delete functions: 1. Automatic storage of illuminance data (maximum storage of 1900 groups), query and delete functions 2. Manual storage of illuminance data (maximum storage of 60 groups), query and delete functions