3M™ Tri-Flange™ Probed Test Plugs are a specially probed version of the standard plug.
3M™ Tri Flange™ Probed Test Plugs are a specially probed version of the standard plug. This product works with the E A Rfit™ Validation System and allows you to conduct an earplug fit test for the Tri Flange and UltraFit Plus earplugs