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The Wheaton® Nephelo culture flask with a sidearm allows growth and turbidity reading at selected intervals without sampling. Simply tilt the flask to allow filling of the sidearm and insert sidearm into colorimeter or spectrophotometer. The side tube is scratch and striation free. Nephelo culture flasks are designed to operate on a platform shaker. Material cannot enter the sidearm when on the shaker. The break-resistant lip accommodates a cotton plug or stopper. Made from Wheaton Wheaton-33® low extractable borosilicate glass that conforms to USP Type I and ASTM E-438 Type I, Class A requirements. Flasks are available with or without a cleanout port and are furnished with required screw caps. Fully autoclavable for sterile applications.