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.

*Not Available in North America


  • 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 x 126 x 35 mm)
Weight: 6.0 oz. (170 g) (incl. batteries)
Warranty: 2 years



2 Years

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