The 70665 Monochromator Integrating Sphere has a two inch interior diameter and is designed for uniform monochromator, sensor and spectrograph illumination for VIS and NIR. It can also be used at the output of a monochromator to uniformly illuminate a single detector or more than one detector. These spheres have excellent diffusing properties, proper baffling to prevent first strike radiation from entering the instrument. 1.5 Inch Series flanges and a 1/4-20 tapped hole facilitate mounting. PTFE coating for a 250 to 2500 nm range with (2) 1/2 inch ports.