The 3M™ Fit Test Adapter 601 is used to conduct quantitative fit testing on 3M™ Reusable Respirator Facepieces with bayonet-style cartridge/filter holders.
 
Filters for the 3M™ Fit Test Adapter 601 are sold separately. The correct respirator fit is essential to ensuring the maximum protection possible, and as a result, the greatest safety for those who use it.