Fangrui Product Details 1. Trsi Ta636b Integrated Digital Lux Meter Light Brightness Measuring Support Bt 2. Display: 30x30mm, Four-number Display, Maximum 1999 3. Measuring Range: 0.1 To 200000lux (0.01-20000fc) 4. Measuring Range: 200200020000200000lux (20200200020000fc) 5. Accuracy: +-(+10dgts), Calibrated With Standard Flat Light With Color Temperature 2856k 6. Resolution: Lux Less Than 200:0.1; Lux Greater Than Or Equal To 200:1 7. Sensor: Silicon Photodiode With Filter Lens 8. Sampling Rate: 2 Times Per Second 9. Incident Angle: 120 Degrees 10. Repeatability: +- 11. Spectral Range: 400 To 700nm 12. Automatic Shutdown: 15 Minutes Without Operation 13. Working Environment: -10 To 50 Degrees Celsius, No More Than Relative Humidity, Indoor Altitude Less Than 2000m 14. Storage Temperature: -10 To 50 Degrees Celsius, No More Than Relative Humidity 15. Power Supply: 2 X 1.5v Aaa Batteries (not Included) 16. Dimensions: 150x56x28mm 17. Net Weight: About 150g 18. Connect To Mobile Phone Via Bluetooth To Record Data, Effective Distance 10m