Designed to measure LED and laser sources from 200–850 nm, PD300RM Irradiance and Energy Density Sensor automatically adjusts to provide correct power and energy measurements based on specific wavelength designated by user. Unit also incorporates cosine corrected quartz glass diffuser, suitable for UV radiation. Model PD300RM-UV measures irradiance levels from 15 nW/cm² to 300 mW/cm², while PD300RM-8W measures irradiance from 0.2 µW/cm² to 8 W/cm².