Earplugs equipped with a probe tube for fit testing using the 3M(TM) E-A-Rfit(TM) Validation System. Cannot be used for hearing protection. These test earplugs are modified with a probe tube for use during earplug fit testing with the 3M(TM) E-A-Rfit(TM) Validation System 3M is Leading the Advancement of Hearing Conservation(TM)