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              National Scientific (Thermo Scientific Inc.) Thermo National Scientific F2520-5 0.20µm PVDF Membrane Centrifugal Filters, 2mL Capacity - NF2520-5Choose Options
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              National Scientific (Thermo Scientific Inc.) Thermo National Scientific F2520-6 0.45µm PVDF Membrane Centrifugal Filters, 2mL Capacity - NF2520-6Choose Options
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              National Scientific (Thermo Scientific Inc.) Thermo National Scientific F2520-7 0.20µm PTFE Membrane Centrifugal Filters, 2mL Capacity - NF2520-7Choose Options
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              National Scientific (Thermo Scientific Inc.) Thermo National Scientific F2520-8 0.45µm PTFE Membrane Centrifugal Filters, 2mL Capacity - NF2520-8Choose Options
 
        
        