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PTFE membrane for ambient air PM2.5 monitoring

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Whatman PTFE PM2.5 Air Monitoring Membrane Filter, 2.0 µm, 46.2 mm, w/Support Ring, Sequentially Numbered, 50 Pack, 7592-104
Regular Price $688.00 Price $627.95
Tisch Scientific PTFE PM2.5 Air Monitoring Membrane Filter, 2.0um, 46.2mm, w/Support Ring, Sequentially Numbered, 50 Pack, SF18040
Price $411.99 As low as $350.95
Tisch Scientific PTFE PM2.5 filter membrane, PTFE 2.0um, 37mm OD, with Clear PP support ring, 50pcs/box, PM258650
Regular Price $218.50 Price $190.00
Tisch Scientific PTFE PM2.5 filter membrane, PTFE 2.0um, 25mm OD, with ClearPP support ring, 50pcs/box, PM258651
Regular Price $248.40 Price $216.00