Whatman 10408712, Mixed Cellulose Ester Filter, ME Range (ME 24), 3.1 mm white/black grid for membrane-butler, 0.2um pore size, 47 mm circle (400 pcs) Regular Price $499.02 Price $433.36 Add to Cart Whatman 10406972, Mixed Cellulose Ester Filter, ME Range (ME 24), 3.1 mm white/black grid, 0.2 um pore size, 50 mm circle (100 pcs)