3M 93712, Tri-Flange Probed Test Plugs 393-2011-50, 10 Pair/Bag, 5 Bags EA/Case, 50 EA/Case, 7000128263

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