Williams Sound PLM FSMP
Field Strength Meter


Our Price: $236.34
List Price: $346.00
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The new PROLOOP FSM Plus accurately measures the magnetic field strength of induction loop systems, according to IEC 60118-4:2006 and BS 6083, Para. 4. 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 (3dB resolution)
  • Output: 3.5 mm stereo headphone jack with volume control
  • Dimensions: 3.3" x 5" x 1.4"
  • Weight: 6.0 oz. (170 g) (incl. batteries)
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