Specification: Model: SM206 Resolution: 0.1W/m², 0.1Btu/(ft²-h) Range Error: ±10W/m² (±3Btu/(ft²-h) or ±5% of measured value Temperature Error: ±0.38W/m²/℃ ±0.12Btu/(ft²-h)/℃ deviation at 25°C Display: 3-3/4 LCD display, maximum 3999 Overload Display: "OL" Shift: <±3% /year Measurement Range: 0.1-399.9W/m², 1-3999W/m², 0.1-399.9Btu/(ft²-h), 1-3999Btu/(ft²-h) Sampling Time: 0.25 seconds/time Operating Temperature and Humidity: 0~50℃, <80%RH Storage Temperature and Humidity: -10~60℃, <70%RH Battery: 9V battery (NOT included) Size: 132*65*38mm / 5.2*2.6*1.5in Weight: 325g / 11.5oz (approx.) Package list: 1 * Solar Radiation Measuring Instrument (battery is NOT included) 1 * User Manual 1 * Packing Box