Features Precision Sunlight Measurement: Accurately measures sunlight intensity to ensure optimal solar energy harnessing for various applications Dual Measurement Units: Choose between W/m² and Btu for flexible data analysis, catering to different measurement preferences Advanced Data Features: Enjoy maximum value hold and data hold functions for easy monitoring and reliable long-term measurements User-Friendly Operation: Direct measurements without adjustment allow for straightforward usage, making it ideal for both professionals and enthusiasts Versatile Application Use: Perfect for solar radiation measurement, research, meteorology, agriculture, and physical experiments, enhancing research accuracy Features: 1、This meter is a precision instrument measuring the intensity of sunlight. 2、There are two units that can be selected: W/m2 and Btu. 3、It supports maximum value hold function and data hold function. 4、Measure directly without adjustment, steadily measure for a long period. 5、Widely used for solar radiation measurement, solar energy research, meteorology, agriculture, physical and optical experiments. Specification: Features: This meter is a precision instrument measuring the intensity 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 transmission intensity of glass to verify the performance of the glass, for example, car window performance test. Specification: Model: SM206 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 19999 Overload Display: "OL" Shift: between±1.5% /year 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℃, between80%RH Storage Temperature and Humidity: -10~50℃, between70%RH 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 Package List 1 * Solar Radiation Measuring Instrument (battery is NOT included) 1 * User Manual 1 * Packing Box