Fangrui Product Details 1. Lcd Display Solar Power Radiation Meter 2. Resolution: 0.1w㎡, 0.1 Btu(ft2-h) 3. Range Error: 10w㎡ [3 Btu(ft2-h)] Or Of Measured Value 4. Temperature Error: 0.38w㎡ ℃ [0.12 Btu(ft2-h)℃] When Deviating From 25℃ 5. Display: 3-34 Lcd Display, Display Value 3999 6. Overload Display: "ol" 7. Range: 0.1-399.9 W㎡, 1-3999 W㎡, 0.1-399.9 Btu(ft2-h), 1-3999 Btu(ft2-h) 8. Sampling Time: 0.25 Secondstime 9. Operating Temperature And Humidity: 0°c To 50°c Less Than Rh 10. Storage Temperature And Humidity: -10°c To 60°c Less Than Rh 11. Required Battery: 9v Battery (not Included!) 12. Battery Life: About 100 Hours 13. Sm206 Solar Power Meter Is A Precision Instrument For Measuring Light Intensity. It Is Used In Solar Radiation Measurement, Solar Research, Physical And Optical Experiments, Meteorology, Agriculture, And Can Also Be Used To Measure Glass Light Intensity To Verify Glass Performance. It Is Mainly Used For Car Film Measurement, Such As: Window Light Intensity Measurement 14. W㎡ And Btu Two Unit Options 15. Peak Hold Function, Data Hold Function, Direct Measurement Without Adjustment, Long-term Stable Measurement 16. Dimensions And Weight: 132 X 60 X 38mm 17. Weight: About 150g