A line of UV cell windows that are fabricated from sapphire and single crystal quartz for use with Beckman centrifuges and other instruments is available from Meller Optics, Inc. of Providence, Rhode Island. Meller Centrifuge Cell Windows are offered made from sapphire to resist chemicals, scratching, and high pressure and from single crystal quartz for less demanding applications. Designed to allow full contents viewing with Beckman centrifuges and other instruments, they are available wedged one- or two degrees and plano, with chamfers 0.20/0 mm x 45 degrees in two places. Featuring an arrow scribed on their edge that projects the optic access for easy alignment, Meller Sapphire Centrifuge Windows are 19.03 mm dia. ±0.3 mm by 0.5mm thick ±0.10mm and have a 30-5 scratch-dig surface finish. The quartz windows have a 10-5 finish with a central clear aperture of 16 mm and both types are suitable for OEM and field-replacement use. Meller Centrifuge Cell Windows are priced according to material and quantity.