Sterile, disposable unit eliminates preparation time spent on cleaning and autoclaving • All in one assembly combines filtration unit and petri dish and helps to minimize contamination • Preloaded membrane and pad eliminates transfer step and manual manipulation of the membrane • Built-in magnification lid for colony count • Reliable, reproducible results unit-to-unit and lot-to-lot. Cytiva/Whatman Equivalent: 10 497 501 Pall Equivalent: 4761 (50 per PK )