EARPLUG FITTING TOOL
Bringing consistency to foam earplug fittings
Sert-A-Plug: Soft Foam Earplug Fitting Tool
The foam earplug carries the NRR and the protection, Sert-A-Plug inserts the earplug consistently
Featuring the Patented Cert-A-Fit® Technology
In a study presented at the National Hearing Conservation Association’s 2026 conference, users achieved an average PAR of 28.8 dB when foam plugs were inserted with Sert-A-Plug after brief instruction, versus 17.2 dB for naive manual self-insertion measured in the same study. A second group of 44 occupational hearing conservation students, tested in five West Coast cities, averaged 26.8 dB with the applicator after instructor demonstration (Johnson & McCall, NHCA 2026). PAR is a personal fit measurement; individual results vary with ear anatomy, plug selection, and insertion technique. The foam earplug carries its Noise Reduction Rating (NRR) under the manufacturer’s EPA-regulated label.
Specializing in the most important aspect of foam earplug usage, the FIT! Fit Matters “Because It’s Loud Out There!”
- Consistency in foam earplug fittings — Foam earplugs seat to their design depth consistently.
- Ease of application — Simple, efficient, and easy to use!
MR Safe for MRI Environments
Sert-A-Plug is MR Safe
J3 Group labels Sert-A-Plug MR Safe in accordance with ASTM F2503, the recognized standard for marking items for use in magnetic resonance (MR) environments.
Scanner manufacturers require hearing protection for every patient. The rating on the earplug assumes a deep, consistent fit.
Consistent insertion. Sert-A-Plug inserts standard foam earplugs consistently and repeatably, patient after patient.
Insights & Updates From the Hearing Protection World
John Matthew Johnson Featured in NHCA Spectrum Member Spotlight
Sert-A-Plug’s John Matthew Johnson was featured in the latest edition of NHCA Spectrum as part of its Member Spotlight series.... READ MORE
Sert-A-Plug appearance on the NHCA Discussion Panel
Founders John Johnson and Mark Anderson on the “Hearing is Quality of Life” series hosted by the National Hearing Conservation... READ MORE
First-of-its-kind Research Study
Siletz Tribal members John Johnson (Tribal elder) and son Shawn Johnson, J3 group LLC, were in Siletz in early April... READ MORE