The Newport PBS-2 Pellicle Beam Sampler, 74.9 mm OD, 51.6 mm Clear, 375-2400 nm is a beam sampler used during the analysis of biological samples in flow cytometry.

Specifications: 

Clear Aperture: 51.6 mm
Average reflectivity: 8% from 375 - 2400 nm
Surface Quality: 40-20
Material: Polymer Film 
Weight: 1.3 lbs (0.58 kg)
Dimensions 9" W x 6" D x 1" H inches (22.8 x 15.2 x 2.54 cm)