Williams Sound Proloop FSM Measurer of Induction Loops Systems
Last verified June 16, 2026 · classified April 26, 2026
What it is
Summary
AI-generated from vendor-published content · April 26, 2026
This handheld device measures the magnetic field strength of hearing loop (audio induction loop) systems, verifying that they meet international standards (IEC 60118-4) for performance and coverage. It's used by audiologists, hearing loop installers, facility managers, and ADA compliance professionals who need to confirm that a loop system is delivering adequate signal strength, low distortion, and acceptable background noise levels to hearing aid and cochlear implant users with telecoil (T-coil) settings. The meter gives you RMS output readings, frequency response, AGC function checks, and distortion measurements, plus a headphone jack so you can also listen to the loop signal directly. This is a professional calibration and verification tool — it tells you whether a loop installation is working correctly, but it does not itself create or amplify any sound for end users.
Quick Facts Catalog facts · auto-generated
- Out of pocket
- Vocational rehab
What Setup Looks Like
- Out of the box
Insert two AA batteries and walk the meter through the loop coverage area to read field strength via the LED display. - With a guide
- Review IEC 60118-4 standard requirements and the meter's user manual to understand acceptable dB ranges for field strength and background noise.
- Configure test range adjustments and A-weighted filter settings for your specific loop installation environment.
- Use the headphone jack to perform an acoustic quality check alongside the meter readings — full verification typically takes 30–60 minutes per room. See manufacturer support resources for detailed instructions.
- With professional help
- A certified hearing loop installer or acoustic engineer interprets results against IEC/BS standards and determines corrective action if the loop is out of spec.
- Formal ADA or standards-compliance audits may require documentation of measurements across multiple test points — plan for a half-day or more for large venues.
Getting it
Many states lend devices like this for free trial periods — find your state's AT lending program.
Where to Get It
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How to Fund This
Equipment like this is often pursued through official state programs. These are common starting points — each program decides its own eligibility and what it covers, so the first step is always a phone call.
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Sources & fine print
Vendor facts (name, price, platforms, vendor link) sourced from Williams Sound — view on vendor site; last verified June 16, 2026.
Classification & description AI-generated from vendor-published content on April 26, 2026 · confidence: high. Vendor specs may lag; verify before relying on details in a clinical or funding artifact.