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37 mm Monitors for Microbial and Contamination Analysis These 37 mm monitor units are disposable filter units which consists of a transparent plastic container in which a Mixed Cellulose Ester membrane and an absorption pad/support disc are assembled together. Monitors are mainly used for microbiological inspection of gases and liquids. There are two types available, 2-piece and 3-piece units in which 0.45 µm or 0.80 µm membranes are placed together with a pad. 2-piece units are available with membranes with a hydrophobic edge to prevent air locks. Collected samples can be cultured in place or be removed for further analysis or study. Specifications and Ordering Information Click column heading for sort