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The PD300R is a general purpose circular geometry photodiode laser measurement sensor with a 10mm aperture and removable filter. Without filter, its spectral range is 350 - 1100nm and its power measuring range is 500pW - 30mW. With filter the spectral range is 430nm - 1100nm and the power range is 200µW - 300mW. The sensor comes with a 1.5 meter cable for connecting to a meter or PC interface.