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Thank you for selecting our product. Before using this meter, please carefully read this Manual. It will instruct you on correct operation methods and simple examination and handling essentials so you can benefit from its advantages. 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. For example: Measurement of light intensity through vehicle windows. 1.Features ♦Selectable from two units: W/㎡and Btu ♦ Peak value retention function ♦ Data retention function ♦ Measure directly without adjustment ♦ Steadily measure for a long period 2.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 / ℃ [ ±0.12Btu/(ft²-h)/℃] deviation at25℃ ♦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: 0.25s/time ♦Operation temperature and humidity: 0°C to 50°C