[High Accuracy]The Solar Power Meter is accurate, Drift: &;1.5%/year, and it's comes with two selectable unit W/m² and Btu/ (ft2-h), with measuring range of 0.1~1999.9 W/m²/ 0.1~1999.9 Btu/(ft2-h) [Data HOLD] pyranometer is designed with "HOLD" button to be to support data retention for convenient recording and review of measurement [Large LCD Display] The digital solar power meter is equipped with large LCD display, the maximum displayed numerical value is 19999 [Easy Operation]The Sun Meter support measureing wave length range is from 340 to 1100nm, the sampling time is 2.5 t/s, you may directly measure without any adjustment [Wide Applications]The solar watt meter is Ideal for a wide range of applications including solar panel installation, solar research, photovoltaic system maintenance, building performance assessment, meteorology, agriculture, and measuring light intensity through vehicle, Manufacturer: Jnchdghwa