MEASURES: Displays solar power intensity from 0 to 2000 W/M2 or 0 to 634 BTU/(ft2 x H). END MOUNTED: Extremely stable light sensor with a wide spectral range (400-1100nm) and a sampling rate of 4 times/second. COSINE CORRECTED: Uses a silicon photodiode and cosine Angular correction (<5% for angles < 60°) to measure the solar power radiated from any direction, angle or position. FEATURE RICH: Current time setting, automatic transmission of measurements and data logging of up to 99 readings, as well as min/max/Avg memory + data Hold and auto power off (can be disabled). GENERAL TOOLS: We're a recognized leader in designing and developing specialized precision tools dedicated to delivering exceptional customer service. We encourage artisans and DIYers to work smarter, measure better, and repair more productively.