Photo by Venmark InternationalA line of sapphire UV cell windows for Beckman centrifuges that simplify field replacement and are impervious to acids, alkalis, body fluids, and plasma are available from Meller Optics Inc, Providence, RI. Meller Sapphire centrifuge windows are ideal for use where chemical-, scratch-, and high-pressure resistance are required. Suited for Beckman centrifuges and similar instruments, they feature a scribed arrow on their edges to project the optic axis and simplify installation alignment. The windows measure 19.03 mm dia. ±0.03 mm by 5 mm thick ±0.10 mm, and are offered wedged 1° or 2° and plano, with chamfers 0.35 mm x 45° in two places, and have a 30-5 scratch-dig surface finish. For less-demanding applications, windows made from quartz are offered with a 10-5 scratch-dig surface finish and a 16.00 mm central clear aperture. For more information, visit Meller Optics.