This meter is used to measure solar power (sunlight). It is an easy to use instrument which offers a compact design and robust construction. It is designed for environmental monitoring of sunlight intensity and is particularly useful to solar power engineers when comparing the intensity of sunlight with the efficiency of solar panels. 0 to 1,999w/m or 0 to 634BTU/(fth) High-accuracy and rapid response sampling 0.25 times per second Sunlight silicon photo diode sensor 50mm LCD display with backlight and function indicators Data hold freezes a displayed value Min/max hold displays the highest and lowest reading since power on Low battery indication Impact-resistant ABS case Supplied with protective lens cap and batteries