Device used to measure power per unit area of incident solar radiation reaching the meter's sensing area. It has high precision light sensor and provides accurate and fast measurement by just turning it on, making the best The device may be used to measure the solar characteristics of glass, film or other transparent materials. Features:High Precision Measure light sources including all visible lightStable for long useMeasure car headlight's light intensitySimple to use General dataConvenient, no need to adjust, data display clearly Specifications: Accuracy:Typically within ± 10W/m2 [±3 BTU/ (ft2*h)] or ±5% whichever is greater in sunlightAdditional temperature included error ± 0.38 W/m2 / °C [±0.12 BTU/ (ft2*h)] / °C] from 25 °COverload: LCD display "OL" Sampling Time: approx. 0.25 seconds Battery Life: approx. 100 hours Operating Temperature: 5 ~ 40 °C (41 ~ 104 °F) Operating Humidity: <80% R.H. Storage Temperature: -10 ~ 60 °C (14 ~ 140 °F) Storage Humidity: <70% R.H. With Low battery indicator Battery: 1 x 9V Battery (included) Item Weight: approx. 150 g (5.3 oz) Shipping Weight: 0.28kg Package Size: 12cm x 17cm x 5cm Set Includes: 1 x Solar Power Meter 1 x 9V battery 1 x Carrying bag 1 x English Instruction Manual Standard Factory Package