A Membrane Filtration Assembly for Microanalysis is a specialized laboratory setup designed for testing and analyzing microorganisms in liquid samples. This assembly is widely used in microbiological analysis, water testing, pharmaceuticals, and quality control processes. Here's a detailed breakdown of the components and their functions:

• Membrane Filter Holder (Cup): Holds the membrane filter securely during filtration.
  Usually made of stainless steel, glass, or autoclavable plastic.
  Can accommodate standard membrane filters (47mm or 90mm diameter are common).
• Membrane Filter:
  A thin polymeric film with specific pore sizes (e.g., 0.2 µm, 0.45 µm) to capture microorganisms.
  Material options include cellulose nitrate, PVDF, PTFE, nylon, or mixed cellulose ester.
• Funnel:
  Holds the liquid sample and directs it through the membrane filter.
  Often graduated to measure sample volume accurately.