Nalgene* Sterile Analytical Test Filter Funnels with CN Membrane

Low-cost disposable, sterile filter funnels for microbiological analysis testing, food/beverage, raw material, sterility testing and finished product quality. Consists of polypropylene upper housing, high-impact polystyrene collar and white cellulose nitrate (CN) membrane. Graduated upper housing separates easily from collar for easy access to the membrane. Cat. no. 977-10492 features gray membrane with white grid that turns black when wet, making it easier to detect and count growing colonies. 0.45 µm membrane filters meet APHA standard methods and have official certification for water quality work. Funnel adapter allows use with No. 8 stopper (977-20176 case of 3). Six funnel adapters included with each case. Membrane diameter is 47 mm.