• Noise at Work
  • Environmental monitoring
  • Sound power (ISO 374x)


  • Color and touch screen
  • Very slim case
  • Full-fledged LAN interface



The NL-53 is a IEC 61672 Class 1 Integrating Sound Level Meter.

“Connect” is the keyword for RION’s new sound level meter
Newly equipped with LAN terminals, the NL-53 offers various enhanced functions to connect to other communication devices and to maximise the effectiveness of noise measurement tasks. The user interface is designed to be intuitive and easy to understand for the ultimate in user-friendliness.

Simultaneous measurement for up to four channels
Set different frequency weighting and time weighting characteristics for each channel to record instantaneous SPL and calculated values.  A single unit can measure up to 4 channels simultaneously, allowing users to reduce their working time.

LAN terminal
By connecting to a network, a remote connection via web browser of PC or smartphone may be established.  You can check the status of the unit, view and acquire measurement data, and listen to real-time audio.

USB Type-C connector
Compatible with USB power supply from mobile battery unit. Enables acquisition of measurement data or settings changes via communication commands.  PCs can read the SD card inside the sound level meter as a removable disk.


  • IEC 61672 Class 1 Integrating Sound Level Meter (Class 2 NL-43 also available)
  • Octave/third octave
  • Wav file recording
  • FFT
  • Full-fledged LAN interface
  • Data stored as CSV file to a memory card for easy import into Excel
  • Outdoor protection kit options


  • IEC 61672-1:2013 class 1
  • ANSI/ASA S1.4-2014/Part 1 class 1
  • JIS C 1509-1: 2017-clss 1, JIS C1516: 2020 class 1



NX-43-EX – Extended function program
This allows users to add the NX-43WR, NX-43RT and NX-43FT programs.

NX-43WR Waveform recording program
This function enables users to record sounds while processing sound levels.

NX-43FT FFT analysis program
FFT analysis enables sound level measurements for each frequency.

NX-43RT Octave, 1/3 octave real-time analysis program
Both allow measurement compliant IEC 61260-1:2014 Electroacoustics – Octave-band and 1/N (fractional) – octave-band filters Part1:Specifications.









Sound level meters

Nor1026 NorReview

Sound level meters

Nor850 Reporting software

Sound level meters

Nor1051 NorConnect

Sound level meters

Nor1256 Sound Calibrator

Sound level meters

Nor1255 Sound Calibrator

Sound level meters

Nor1451 Windscreen, 60mm


Product data

Rion NL53 / NL43

  • Produktdata Rion NL-53 and NL-43 -

    NL-43_NL-53_NL-63_Datasheet_e2303-0.pdf (2798.47KB)

Certificates NL-53

  • Declaration of Conformity -

    DoC_NL-53_2023-02-08.pdf (135.83KB)


Do you have any questions
or need support?

Call Icon Mail Icon