Features 【High quality】:This Solar Power Meter This instrument is a precision instrument for measuring the intensity of sunlight. Large LCD display, 3-3 / 4 LCD display, maximum 3999. High resolution, wide measurement range and short sampling time. 【Data retention】:This Solar Power Energy Meter This professional solar radiation meter panel is designed with a “HOLD” button that supports maximum hold and data hold. Convenient for recording, user-friendly data comparison and experimental investigation. 【Easy to use】:This Solar Radiation Meter Direct measurement without adjustment, long-term stable measurement. Pay attention to the automatic measurement of the probe directly to the light source, and keep the probe clean to avoid affecting the measurement results. The operation panel is simple and convenient. 【Use Fit】 :This Solar Radiation Detector 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. 【Standard parameter】:This Solar Energy Tester The solar radiation meter is available in two units: W / m2 and Btu. “OL” is displayed when overloaded. 9V battery (not including battery). Portable, compact, up to 132 * 65 * 38mm / 5.2 * 2.6 * 1.5in. Measuring range: 0.1-399.9W / m2, 1-3999W / m2, 0.1-399.9Btu / (ft2-h), 1-3999Btu / (ft2-h). 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 ( batter y 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