Specification Brand : Generic BulletPoint1 : This meter is a instrument measuring the of sunlight. BulletPoint2 : There are two units that can be selected: W/m² and Btu. BulletPoint3 : It supports maximum value hold function and data hold function. BulletPoint4 : Measure directly without adjustment, steadily measure for a long period. BulletPoint5 : Widely used for solar radiation measurement, solar energy research, meteorology, agriculture, physical and optical experiments. ItemName : Generic Digital Solar Power Meter Sun Light Radiation Measuring Testing Instrument, Generic14x3g0srb7 ItemPackageDimensions_Height : 5 centimeters ItemPackageDimensions_Length : 20 centimeters ItemPackageDimensions_Width : 15 centimeters ItemTypeKeyword : science-lab-photometers-and-light-meters Manufacturer : Generic ModelNumber : Generic14x3g0srb7 NumberOfItems : 1 PartNumber : Generic14x3g0srb7 ProductDescription : Specification: Features: This meter is a instrument measuring the of sunlight. There are two units that can be selected: W/m² and Btu. It supports maximum value hold function and data hold function. Measure directly without adjustment, steadily measure for a long period. Widely used for solar radiation measurement, solar energy research, meteorology, agriculture, physical and optical experiments. It can also be used to measure the light of glass to verify the performance of the glass, for example, car window performance test. Specification: Model: Resolution: 0.1W/m², 0.1Btu/(ft²-h) Range Error: ± (10%R+2dgts)R: readings Temperature Error: ±0.38W/m²/?[±0.12Btu/(ft²-h)/?] deviation at 25°C Display: 4-1/2 LCD display, maximum display numerical value Overload Display: OL Shift: Measurement Range: 0.1-1999.9W/m², 0.1-1999.9Btu/(ft²-h) Sampling Time: 2.5 seconds/time Operating Temperature and Humidity: 0~40?, Storage Temperature and Humidity: -10~50?, Battery: 9V battery (NOT included) Size: Approx. 132 x 60 x 38mm / 5.2 x 2.4 x 1.5in Weight: 325g / 11.5oz (approx.) Package list: 1 * Solar Radiation Measuring Instrument (battery is NOT included) 1 * User Manual 1 * Packing Box