Williams Sound PLM FSMP Field Strength Meter

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Write a review Q&A SKU: PLM-FSMP PSSL ID#: 100947
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Regular price $369.00 USD
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Williams Sound PLM FSMP Field Strength Meter

The Proloop FSM Plus accurately measures the magnetic field strength of induction loop systems. Designed for professional use, Proloop FSM Plus delivers reliable RMS values on the output level, response frequency, Automatic Gain Control (AGC) function, distortion and background noise in the tested induction loop. In addition, it enables the user to make an acoustic evaluation of the sound via earphones.


  • Conforms to IEC 60118-4: 2006 standard
  • Adjustment possibilities for two test ranges:
  • background noise
  • field strength
  • RMS-measuring range calibrated to 400mA/m = 0dB
  • Handy, light-weight, rugged chassis
  • Switchable A weighted filter


  • True RMS: 125 ms average time
  • Measuring range: +6 dB -40 dB (0 dB = 400mA/m)
  • Power supply: 2x 1.5V AA batteries
  • Display: LED battery status control
  • Field strength: LED-Scale (1dB resolution)
  • Output: 3.5 mm stereo headphone jack with volume control
  • Dimensions: 3.3" x 5" x 1.4"/83 mm x 126 mm x 35 mm
  • Weight: 6.0 oz. (170 g) (incl. batteries)
  • Warranty: 2 years


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