Mobile Hearing Test for Manufacturing Plants: How It Works

Noise is a hazard employers can measure, and hearing tests are how they find out whether their controls are working. Mobile testing brings a calibrated audiometer and a trained technician to the plant, so a whole shift can be tested without anyone leaving the site.

What is mobile hearing testing?

Mobile hearing testing means the audiometric exam is done at the employer's location instead of at a clinic. A technician sets up a calibrated audiometer in a booth or a controlled quiet space, tests each employee in a few minutes, and sends the results for review. Under 29 CFR 1910.95(g), employers must provide audiometric testing to employees exposed at or above an 8-hour time-weighted average of 85 dBA, at no cost to the employee, with a baseline audiogram and annual tests after that. The exam itself is the same whether it happens in a clinic or in a parking lot. What changes is logistics: no travel time, no scheduling employees around outside appointments, and one visit that covers a whole department. The quality of the result still depends on the equipment being current on calibration and the room being quiet enough for the test.

Why does on-site testing matter for safety?

The annual audiogram is the only check that tells you whether hearing protection and noise controls are actually protecting people. A standard threshold shift, compared against the baseline, is the trigger for follow-up under the OSHA rule. When testing is convenient, it gets done on time and for everyone. When it depends on employees driving to a clinic, participation slips and the program has gaps that show up at an inspection. On-site testing also lets the technician see the noise environment, which helps when a result looks off and someone has to decide whether the cause is work exposure or something else.

How does a mobile test day work?

Step	What happens
Before the visit	Employer sends the roster and picks a quiet room or confirms the booth location
Setup	Technician checks the audiometer, verifies ambient noise, and prepares test stations
Testing	Employees are tested one at a time after the required quiet period away from noise
Review	Results go to a qualified reviewer, who flags any shift from baseline
Records	Employer receives audiograms for the program file

Our own process follows this order. Before testing, we confirm the audiometer's calibration date and check the room, because a room that is too loud invalidates the thresholds no matter how good the equipment is. Preparation on the employer side is covered in mobile hearing test day preparation.

How does a mobile hearing test work for manufacturing plants?

A mobile hearing test for manufacturing plants happens on site, so production lines keep running while employees are tested a few at a time. The employer sends a roster, and the technician plans the visit around it. For multi-shift plants, the technician is scheduled across first, second, and third shift, or over consecutive days for a large plant, so no one is missed. The employer provides a quiet room with a door, or confirms the booth location, away from compressors and traffic. The technician checks the audiometer's calibration, verifies ambient noise, and tests each employee one at a time after the required quiet period. New hires receive a baseline audiogram, and employees already in the program receive the annual test, both under 29 CFR 1910.95(g). Results are reviewed against each baseline and the audiograms go to the employer for the program file.

What should employers plan for?

Give employees a noise-free period before the test, since recent loud exposure can temporarily lower thresholds and look like a shift. Hearing protection worn during the prior shift can count toward that quiet period, so ask the provider what they require. Plan a room with a door, away from compressors and traffic. For multi-shift plants, schedule the technician across shifts so no one is missed. If a test cannot be done because the space is too noisy, reschedule instead of recording a result you cannot defend. Records should be kept as the standard requires, and the hearing testing program page explains what we provide for the file.

How Foster runs mobile testing

Foster brings calibrated equipment to the client site and tests employees on the schedule the employer sets. We keep our audiometers on a current calibration cycle through our calibration service, and results are reviewed against each employee's baseline before they reach the employer. See on-site testing for coverage, or request a quote with your headcount and number of shifts.

Frequently asked questions

Who must be offered audiometric testing?

Employees exposed at or above an 8-hour TWA of 85 dBA, under 29 CFR 1910.95(g), at no cost to them.

How often is testing required?

A baseline audiogram, then an annual audiogram for each employee in the program.

Does a mobile test count the same as a clinic test?

Yes, provided the audiometer is calibrated and the room meets the ambient noise requirements of the standard.

Can we test all shifts in one visit?

Yes. The technician can be scheduled across shifts, or over consecutive days for a large plant.

How does a mobile hearing test for manufacturing plants avoid stopping production?

Testing is done on site in small groups released from the line at set times, and the technician covers every shift, so production keeps running.