A Membrane Filter Holder Assembly is a laboratory apparatus used for the filtration of liquids or gases. It consists of a filter holder and support for a membrane filter, which is placed between the two. The filter holder is typically made of plastic or metal and holds the filter in place during filtration.

The membrane filter is usually made of a thin, porous material that acts as a barrier to trap particles or contaminants in the liquid or gas being filtered. The holder assembly provides a secure and leak-proof environment for the filtration process and makes it easy to replace the filter after use.

Membrane filter holder assemblies are commonly used in water treatment, air quality control, microbiology, and other scientific and industrial applications where precise filtration of liquids or gases is required.