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E-A-Rfit™ Validation System

Leading the Advancement of Hearing Conservation

Technology that takes hearing conservation to the next level

EARfit Validation

1: What is the E-A-Rfit™ Validation System?

An objective, quantitative hearing protector fit-test system.

It is technology that takes Hearing Conservation to the next level. Environmental controls, hearing protectors, and on-the-job training are the first steps to protecting your workers against noise-induced hearing loss (NIHL).

2: Fit test your hearing products

Fit test your hearing products

The E-A-Rfit™ system assists in achieving optimal fit through hearing protector selection and employee training. In less than 8 seconds per ear, the system generates a personal attenuation rating (PAR) that indicates a worker’s noise reduction levels for a given fitting and hearing protector. Compare ratings across hearing protectors and fittings to determine best fit.

3: Get objective, personalised results

Get objective, personalised results

Researchers at E-A-RCal Laboratory developed proprietary algorithms to analyze sound pressure inside earcanals. This in-the-ear testing procedure differs from many other systems on the market by providing quantitative data that does not rely on subject response. Fit, train, and motivate every worker using their Personal Attenuation Rating (PAR).

...all that in 8 seconds!

4: What does the kit include?

What does the kit include?

E-A-Rfit™ Validation System Includes:

  • Speaker and Stand
  • Dual –Element Microphones
  • USB Cable
  • Power Cable
  • Roll Model
  • Trial Quantity of Probed Test Plugs and Software

5: List of compatible earplugs

  • 3M 1100/1110 ear plugs
  • E-A-R Classic (corded / uncorded)
  • E-A-R Classic Small
  • E-A-R Superfit( 33 and Superfit 36
  • E-A-Rsoft Yellow Neon / Blasts / 3M Solar (corded / uncorded)
  • E-A-Rsoft FX (corded / uncorded)
  • E-A-R Ultrafit standard / Ultrafit 14 and 20
  • E-A-R Tracers standard and Tracers 20
  • E-A-R Push-Ins (corded / uncorded) and Express(corded / uncorded)

  • and much more to come...
E-A-RFit™ Product Catalogue

3 Simple Steps

Self-fit your plugs

Connect to the microphone

Run the test


Step 1: Workers fit plugs themselves

In less than 8 seconds per ear, the system generates a personal attenuation rating (PAR) that indicates a worker's noise reduction levels for a given fitting

Advantage: Reflects an individual’s fitting methods and indicates if additional training is necessary.


Step 2: Unique dual-element microphone

The unique dual-element microphone measures the noise reduction of each earplug as worn by the worker across the wide range of industrial noise frequencies.

Advantage: Objectively tests 7 frequencies (125 Hz - 8 kHz) in under 8 seconds per ear, so you don’t rely on subjective test responses.


Step 3: Personal Attenuation Rating (PAR)

Patented system and proprietary algorithms quickly analyze real-ear data to provide Personal Attenuation Rating (PAR) and fit variability.

Advantage: PARs can assist in determining if the level of hearing protection your workers are getting is appropriate to their work environment.

Documented Results: Easy-to-understand test results are documented for each test subject, both in print and electronic formats, for future reference.


System Implementation


Look How Well 3M™ E-A-Rfit™ Validation System Fits Into Your Hearing Conservation Program

Integrating hearing protector fit testing into your hearing conservation program benefits everyone from new hires to high-risk workers.


  • Establish baseline values for new workers
  • Helps identify workers receiving inadequate protection that leaves them at risk of threshold shifts
  • Validate high protection levels required by workers in high noise areas

Fit, Train and Motivate

  • Provides tool for training proper insertion techniques and to assess proficiency
  • Great for required refitting or retraining as required by OSHA after standard threshold shifts (STSs) are detected.
  • Motivates employees by helping them realize the control they have in protecting their hearing

Assess & Manage

  • Improves long term performance of your hearing conservation program
  • Indicates employees needing further fit training or alternative hearing protectors
  • Input your noise exposure data and the E-A-Rfit software can help you identify the most appropriate hearing protector(s) and help minimize over/under protection

"Good, Better, Best"

A Tailored Programme Around Your Workplace’s Needs

There are 3 options for incorporating the 3MTM E-A-RfitTM Validation System into a hearing conservation programme, all designed to suit your unique needs

  • Option 1: Audit Mode (Good)
    This is the base-level application of the E-A-Rfit System, acceptable for wearers exposed to noise levels less than 90dBA
  • Option 2: Fit & Train Mode (Better)
    An enhanced way to optimize the system, with repeat measurements and more regular checks.
  • Option 3: Ultimate E-A-RFit™ Usage Mode (Best)
    For optimimum precision in predicting employee protection and enhancing individual use and performance.

Recommended Applications of E-A-Rfit™ Validation System (pdf, 238Kb)


My EARfit™


E-A-Rfit™ Case Study

This page is your page. Do not hesitate to comment and share your experience of the E-A-Rfit™ validation system.

Contact Us



Coming soon... testimonials from companies who have adopted the 3M™ E-A-Rfit™ Validation System


Brochure Downloads

E-A-Rfit™ Brochures

Find out more about the 3M™ E-A-Rfit™ Validation System

E-A-Rfit™ Brochure (pdf, 893Kb) E-A-Rfit™ Leaflet (pdf, 799Kb)

Technical Support

How does it work? What is the Field Microphone In Real Ear (F-MIRE) technology? Find out more about the technology behind this solution.

The Field MIRE approach to Measuring Hearing Protector Attenuation (pdf, 2.6Mb) Recommended Applications of E-A-Rfit™ Validation System (pdf, 238Kb)

Demonstration Videos

Tips and tools for fitting...

Premoulded Earplugs Pod Earplugs Roll Down Earplugs Fitting Poster (pdf, 5.6Mb)


Installation Guides

Find out more about the 3M™ E-A-Rfit™ Validation System

E-A-Rfit™ Installation Guide (Full) (pdf, 1.1 MB) E-A-Rfit™ Installation Guide (Upgrade) (pdf, 472 kB)

Software Download

Note: Click on the Full Installation link if you are a new user or you are running E-A-Rfit™ version 3 or earlier. Click on the Upgrade Installation link if you are running E-A-Rfit™ 4 or later.

E-A-Rfit™ Software Full Installation (exe, 300 MB)
E-A-Rfit™ Software Upgrade Installation (exe, 15.8 MB)

In order to use the E-A-Rfit™ Validation System to measure hearing protector attenuation, you will need to:

  1. Purchase a 3M™ E-A-Rfit™ Kit model 393-1000 from your 3M distributor. This kit includes the E-A-Rfit™ hardware and accessories you need to get started along with a sample of probed test earplugs. Once you begin using the system, you will need to purchase additional probed test earplugs for use during testing.
  2. Download the current version of the E-A-Rfit™ software and the installation guide using the links on this page.
  3. Contact 3M to obtain a Technician Code and password. Click here to create an e-mail request. Type "technician code request" in the subject field then fill in the form making sure to enter the serial number of your E-A-Rfit™ loudspeaker in the "Serial Number" field. You will receive a response in 24 hours.





3M is pleased to introduce a dynamic, new online training program to guide users of its E-A-Rfit™ Validation System through the process of system set-up, data entry, earplug attenuation testing, and reporting.

The training consists of 7 modules and you can view them and listen to them at your leisure.

For any questions or for more details of E-A-Rfit™ Validation, please contact us.


Technical Support

Technical Support

Please complete the form below to send us a message if you have questions, feedback, or were unable to find an answer on our E-A-Rfit™ Support website.

If you are requesting a Technician code, type "technician code request" in the subject field then fill in the form making sure to enter the serial number of your E-A-Rfit™ loudspeaker in the "Serial Number" field. You will receive a response in 24 hours.

* All fields are required.

The information you provide on this Contact Us form will be used to respond to your request and as further described in our Privacy Policy .


Thank you

Thank you

Thank you for your interest in E-A-Rfit™ Validation. We will aim to respond to you within 24 hours.