Class 1 Sound Level meter mainly designed for advanced noise assessments and noise logging, featuring event triggered sound recording and markers. May optionally be fitted with 1/1- and 1/3-octave filters with multispectra down to 100ms time resolution.

The SD-card makes it easy to store and import measurement data to a PC.


  • Environmental noise assessments
  • Sound recording
  • Noise source identification
  • HVAC noise
  • Noise hazards in the workplace
  • Remote noise monitoring
  • Product development
  • Noise labelling
  • General purpose sound level meter


  • Precision integrating sound level meter to IEC 61672 class 1
  • Handheld real-time 1/1- or 1/3-octave frequency analyser (6,3Hz-20kHz)
  • Measurement of A-weighted levels simultaneously with either C- or Z-weighted levels
  • Parallel detection of SPL, Leq, Lmin, Lmax, LE and Lpeak
  • 120 dB dynamic range giving a “one-range” instrument
  • Measures Lpeak levels up to 140 dBParallel detection of F, S and I time constants
  • USB 2.0 and High-speed RS-232 serial interface
  • SD memory card and large high speed internal memory
  • Sound recording in 8, 16 or 24 bit format with 12 or 48 kHz sampling
  • Up to 90 sec. audio recording pretrigger
  • High-resolution graphical backlit display
  • Manual or automatic storage of results
  • Automatically repeated measurements with clock synchronization
  • Pause/Continue function with back erase feature
  • Results displayed as dB or linear values
  • Numerical printouts
  • AC output signal
  • Windscreen correction
  • Support for IEPE sensors
  • NC, NR and RC rating
  • Multiple language selection
  • Moving Leq

Option packages:

  • Standard package containing the basic Nor139 with the options 1, 3, 4 and 5.
  • Environmental package containing the basic Nor139 with the options 4, 5, 6, 7, 8 and 16.


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