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 secondSunlight silicon photo diode sensor50mm LCD display with backlight and function indicatorsData hold freezes a displayed valueMin/max hold displays the highest and lowest reading since power onLow battery indicationImpact-resistant ABS caseSupplied with protective lens cap and batteries