Solar Radiation Power Meter SM206 used in solar radiation measurement, solar research, physical and optical experiments, metrology, and agriculture. Product description: This meter is a precision instrument for measuring the glass light intensity. It is used in solar radiation measurement, solar research, physical and optical experiments, metrology, and agriculture. It can also be used to measure glass light intensity to verify glass properties. Technical Specs: Display: 3 3/4LCD display, max displayed numerical value 3999 Resolution: 0.1W/mm2, 0.1Btu/(ft2-h) Error Range: +-10W/mm2 (+-3 Btu/(ft2-h)) or +-5% of the measured value Temperature error: +-0.38W/m2/degree Overload display "OL" Range: 0.1~399.9 W/m2, 1~3999W/m2, 0.1~399.9 Btu/(ft2-h), 1~3999Btu/(ft2-h) Sampling time: 0.5 second Operating Environment: Temperature: 0~50 Centigrade (32~122 Fahrenheit) Power: one 9V battery (model 6F22) Dimension: 132L*60W*38H (mm).