From the SCBAs and military-quality gas masks used by fire service and law enforcement to N95 filtering

facepiece (disposable) respirators donned by healthcare workers and the variety of respirators used by industrial organization, the goal mains constant – protect individuals from known and unknown respiratory hazards.

But the highest protection level can't be achieved if the respirator isn't donned properly. That's where TSI PortaCount® Respirator Fit Testers come in.

Link to TSI world link