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Merck
Whatman® ME membranes for microbiological control ME25/41 STL membrane circles green, diam. 50 mm, pore size 0.45 μm, black grid, sterile

Whatman® mixed cellulose ester ME25/41 filter discs 0.45 μm pore size

Whatman® ME membranes for microbiological control ME25/41 STL membrane circles green, diam. 50 mm, pore size 0.45 μm, black grid, sterile