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Merck
Whatman® ME membranes for microbiological control ME26/31, 3.1 mm grid, for Membrane-Butler, pore size 0.6 μm, white grid, diam. 50 mm

Whatman® mixed cellulose ester ME 26 filter discs 0.6 μm pore size

Whatman® ME membranes for microbiological control ME26/31, 3.1 mm grid, for Membrane-Butler, pore size 0.6 μm, white grid, diam. 50 mm