Williams AV PLM FSMP PROLOOP FSM Plus Magnetic Field Strength Measuring Device

Deliver consistent assisted-listening performance and simplify commissioning with the Williams AV PLM FSMP PROLOOP FSM Plus magnetic field strength measuring device. This hearing loop field strength meter is built for AV integrators, security and facilities managers who need IEC 60118-4 compliant verification, reliable monitoring and fast on-site troubleshooting. The unit provides RMS-measured readings calibrated to 400 mA/m = 0 dB, a switchable A-weighted filter and two test ranges so you can isolate background noise from true loop field strength. A color-coded display and a 3.5 mm headphone jack enable quick diagnostics and real-time audio monitoring for accurate tuning during installation and maintenance. Lightweight and ergonomically designed, the PLM FSMP reduces installer fatigue and supports repeatable documentation for accessibility and safety audits. Use it to commission induction loops in auditoriums, security checkpoints, transportation hubs and public venues where clear assisted listening is essential. For dependable verification and streamlined maintenance of hearing loop systems—order the Williams AV PLM FSMP today or contact your sales rep to integrate it into your monitoring and security workflow.

• Ensures IEC 60118-4 compliance for hearing loop installations, helping integrators certify performance and reduce callbacks
• Real-time monitoring with 3.5 mm headphone jack and color-coded display for fast on-site diagnostics and verification
• RMS-calibrated measurement (400 mA/m = 0 dB) for accurate, repeatable field strength readings during commissioning and maintenance
• Switchable A-weighted filter and two test ranges to separate background noise from loop field strength for precise tuning
• Lightweight, ergonomic design with low-battery indicator for reliable use by AV, security and facilities teams in the field