This spectral reflectance standard is used as a reference for diffuse reflectance spectroscopy. The reference is manufactured from PTFE material contained in a circular metal housing.

The reference target is available in 2 different standard sizes. 

The SRR has a diffuse reflectance of 99% from 400nm - 800nm, >98% from 300nm - 1800nm (UV-Vis-NIR region) and >92% from 250nm - 2500nm.