Williams AV PLM FSMP Hearing Loop Field Strength MeterThe Field Strength Meter helps assist in measuring, adjusting and commissioning a hearing loop system by measuring magnetic loop signals and testing for Electromagnetic Background Noise. Lightweight, ergonomic meter has two calibrated measuring functions and two types of filters for removing background noise and adjusting magnetic field intensity. Filter measuring functions by the basis of the listening curve of human ears (A) or by the basis of their