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Are They Fully Protected?
Why Choose the E-A-Rfit Dual-Ear System
Science-based fit testing
Is Your Hearing Protected? 3M™ E-A-Rfit™ Dual-Ear Validation System
Quantify Every Worker's Hearing Protection in 5 Seconds
Scientific Fit Testing — Say Goodbye to Guesswork
In welding, stamping, textile, and construction environments, even the highest-NRR earplugs or earmuffs can reduce protection by half if worn incorrectly or without a proper seal. As an authorized 3M Taiwan distributor, DAIWAN introduces the E-A-Rfit Dual-Ear Validation System — based on Field Attenuation Estimation System (FAES) technology — which objectively measures each worker's Personal Attenuation Rating (PAR) in seconds, helping companies move beyond guesswork and build real hearing conservation programs.
Why Fit Testing Matters
Traditional hearing protection relies on the Noise Reduction Rating (NRR) printed on the package — but real-world attenuation varies dramatically based on each person's ear canal shape, wearing technique, and protector type. The same earplug might deliver 29 dB of protection for one worker and only 10 dB for another — well below what's needed for safety. Only by measuring each worker's individual PAR can you confirm they're truly protected and intervene early when protection falls short.
Three Simple Steps to Individual Validation
Fit
The worker self-inserts their usual earplug or positions their earmuff, exactly as they would on the job.
Test
A dual-microphone system is connected and the speaker plays test tones across a broad industrial noise spectrum.
Assess
The system calculates the worker's PAR value to determine whether their protector is adequate for their specific work environment.
See It in Action
▶ Watch the Demo Video on YouTube
Understanding Pass & Fail
The protector is correctly fitted and provides sufficient attenuation for this worker's specific noise exposure.
The protector is not inserted correctly, or the model/size doesn't match this worker's ear canal. Retraining or replacement is needed.
Why Choose the E-A-Rfit Dual-Ear System
Bilateral in 5 Seconds
Tests both ears simultaneously in under 5 seconds, dramatically reducing time on the floor.
Plugs & Muffs
Compatible with both earplugs and earmuffs, covering a wide range of hearing protection devices.
7-Frequency Testing
Measures across 7 standard frequencies from 125 Hz to 8000 Hz for objective, quantified results.
International Standard
Compact and lightweight design, compliant with ANSI/ASA S12.71-2018.
Product Specifications
| Item | Specification |
|---|---|
| Test Frequencies | 125, 250, 500, 1000, 2000, 4000, 8000 Hz (7 frequencies) |
| Measurement Index | Personal Attenuation Rating (PAR), A-frequency weighted |
| Speaker Dimensions | Approx. 9.5(W) × 16.5(L) × 15.2(D) cm, aluminum black housing |
| Speaker Weight | Approx. 1,406 g (3.1 lbs) |
| Power Supply | 120–240 VAC, 50–60 Hz |
| Operating Temperature | 5°C – 40°C |
| System Requirements | Microsoft Windows 7/8/10 (32/64-bit), .NET Framework required |
| Compliance | ANSI/ASA S12.71-2018, IEC 61010-1, CE, RoHS / WEEE |
* Specifications compiled from 3M official English product documentation. Please refer to the latest 3M publications for the most current information.
Official Document Downloads
Training & Follow-Up: Sustaining Long-Term Protection
3M conducted a study across 4 facilities of a major U.S. metal can manufacturer, enrolling 327 workers who had never undergone fit testing. At baseline, 28% of workers failed to achieve adequate protection and were classified as high-risk for noise-induced hearing loss (NIHL).
After additional training or switching to a better-fitting earplug, the intervention group (n=91) showed a significant improvement in mean PAR (95% CI: 10.3 – 13.4 dB); at 6-month follow-up (n=70), significant improvement was maintained (95% CI: 6.3 – 11.2 dB).
The study also found that workers' self-reported confidence does not reliably predict actual protection levels, and PAR values may decline slightly over time without reinforcement. This confirms that regular fit testing and ongoing follow-up are essential for sustaining effective hearing protection.
Recommended For
New Employees
Establish a hearing protection baseline at onboarding.
High-Noise Area Workers
Verify that workers achieve the high attenuation their environment demands.
Threshold Shift Risk Workers
Identify under-protected workers early for timely intervention.
Compliance-Driven Organizations
Document fit test records to substantiate your hearing conservation program.
E-A-Rfit Frequently Asked Questions
DAIWAN ABRASIVES CORP.: Authorized 3M Taiwan Distributor
Official 3M Authorization
All 3M hearing protection products and consumables are factory-genuine.
Full Certification
ISO 9001, AS 9120, ISO 14001 management system certified.
Expert Selection
Technical team assists with hazard assessment and customized protection planning.
Nationwide Supply
Central Taiwan warehouse and logistics center, supplying multi-brand industrial products across Taiwan.
Ready to Bring E-A-Rfit to Your Facility?
Share your workplace details (noise environment, workforce size) and our team will arrange a product demonstration, on-site assessment, and hearing conservation plan proposal.
Sources: 3M™ E-A-Rfit™ Dual-Ear Validation System product brochure, specification sheet, and Technical Bulletin; 3M Taiwan official website. 3M, E-A-R, and E-A-Rfit are trademarks of 3M Company. Study data cited from 3M-sponsored research (Smith, Lusk & Monaco, 2014). Actual results may vary by work environment.