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Shipping Policy : Battery not included during the shipping Introduction: This meter is a precision instrument for measuring light intensity. It is used in solar radiation measurement, solar research, physical and optical experiments, meteorology, and agriculture. It can also be used to measure glass light intensity to verify glass properties. Technical Specifications ▲1.Resolution: 0.1W/m2, 0.1 Btu/(ft2-h) ▲Error range: ± 10W/m2 [±3 Btu/(ft2-h)] or ±5% of the measured value Temperature error: ±0.38W/m2 / ℃ [ ±0.12 Btu/(ft2-h)/℃] deviation at 25℃ ▲Display: 3-3/4LCD display, maximum displayed numerical value 3999 ▲Shift: < ±3% /year ▲Overload display "OL" ▲2.Range: 0.1-399.9 W/m2, 1-3999 W/m2, 0.1-399.9 Btu/(ft2-h), 1-3999 Btu/(ft2-h) ▲Sampling time: 0.5 second ▲Operation temperature and humidity: 0°C to 50°C