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Merck
Whatman® MicroPlus ST membranes for microbiological control MicroPlus-21 ST membrane circles white, cellulose nitrate, diam. 50 mm, pore size 0.45 μm, black grid, sterile, pkg of 100 ea

Whatman® celluose nitrate MicroPlus-21 filter discs 0.45 μm pore size

Whatman® MicroPlus ST membranes for microbiological control MicroPlus-21 ST membrane circles white, cellulose nitrate, diam. 50 mm, pore size 0.45 μm, black grid, sterile, pkg of 100 ea