SM206 Solar Power Meter Digital Sunlight Meter Handheld Sun Light Radiation Measuring Testing Instrument Solar Power Radiation Meter W/m²&Btu Two Units

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: ±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