The surface of Rion's noise exposure meter "NB-14"

To be released


Personal Noise Dosimeter

Corresponds to noise work environment measurement for occupational safety and health purposes

The back of Rion's noise exposure meter "NB-14"
Male Worker Wearing Hearing Protection Equipment

What is a Noise Dosimeter?

What is it used for?

Noise Dosimeter is a device that measures how much noise workers are exposed to in the workplace each working day. A compact device is attached around the ear such as the head and shoulders of the person to be measured.

Why do we need a Noise Dosimeter?

For example, in many construction sites, there is constant loud noise. People who work there are chronically exposed to noise, and their hearing deteriorates over time, leading to occupational hearing loss.

Long-term exposure to loud noise increases the risk of developing hearing impairment.

In order to protect the hearing health of workers, it is necessary to measure the noise in the workplace and take countermeasures.


Rion's noise exposure meter "NB-14"
  • Easy operation
  • Simple report generation
  • Compact, lightweight and wearable

How to use

Rion Noise Dosimeter

Use two buttons to start/stop measurement.

Measurement can be done in simple four steps.

Automatic sound calibration

(before measurement)



Automatic sound calibration

(after measurement)

The alligator clip will grip firmly.

It does not come off easily even during work.

The Noise Dosimeter should be worn so that the microphone will be positioned near the worker's head, neck and shoulder. You can take measurements without worrying that the device will come off even during work that involves vigorous movement.

Press and hold the START/STOP key to start/stop measurement.

The STATUS LED flashes orange during measurement.

No operation required until measurement is completed.

Noise exposure measurement in the work environment is based on a single day. NB-14 can measure more than 12 hours on a single charge and can hold measurement data for about 48 hours.

Rion's noise exposure meter "NB-14"
Explanation of the flashing color of the light of Rion's noise exposure meter "NB-14"
Orange Dot Light

The LED color tells you the amount of noise exposure.




The degree of noise exposure is indicated by the color of the LED light. The worker's status can be checked without going near the worker.

Mobile Phone Icon

A mobile app that allows you to easily check the measurement results on site.

What can be checked:

  • Real-time noise level measured by NB-14
  • Data saved in the main unit

You can use the app by connecting the NB-14 and a smartphone with a cable. The app is available on the Google Play store.

Viewing measurement data

Measurement results report

Dedicated PC software for viewing measurement data and creating reports.

The Noise Exposure Data Management Software AS-05 Viewer loads the data measured by the NB-14 into a computer, allows you view the measurement data, and output reports that describe necessary items for the noise measurement.

It's so lightweight you will forget you are wearing it.

85g Weight of 3.5 AA batteries.

Noise measurement report created by software compatible with Rion's noise exposure meter "NB-14"
Battery Charging Icon
Battery Charging Icon
Battery Charging Icon
Battery Charging Icon
Battery Charging Icon

Leave the preparations for measurement to NB-14.

In order to measure the noise exposure correctly, it is important to check the equipment before and after measurement (acoustic calibration). The check is automatically completed by attaching a check device (sound calibrator) to the NB-14 microphone.

Specifications NB-14


  • IEC 61252 : 2017
  • IEC 61672-1: 2013 class 2
  • JIS C 1509-1: 2017 class 2
  • VCCI class B

Measurement functions

(simultaneous measurement and processing)

  • Equivalent-continuous A-weighted sound pressure level
  • Equivalent-continuous C-weighted sound pressure level
  • C-weighted peak sound level
  • Dose as percentage of permissible noise level exposure limit (A-weighted sound pressure level)


  • UC-52(representative sensitivity:-33 dB)

Store cycle

  • 1 s

Sound level range of measurement

  • Equivalent-continuous A-weighted sound pressure level 58 dB to 143 dB
  • Equivalent-continuous C-weighted sound pressure level 58 dB to 143 dB
  • C-weighted peak sound level 75 dB to 146 dB

Frequency range of measurement

  • 20 Hz to 8 kHz


Power status, measurement status, overload/under range detection,* and noise exposure displayed with LED illumination.

* Shock detection function: When the device detects a shock exceeding the preset threshold, the LED will illuminate, and the shock vibration event will be recorded to internal memory because such shock vibrations can influence measurement results.

Internal memory

  • Stores data for approximately 48 hours of measurement.

Power source

  • Rechargeable lithium ion battery (secondary battery)
  • Continuous operation time: ≥12 hours

Operating temperature/ humidity range

  • Temperature: -10°C to 50°C
  • Humidity: 10% to 90% RH (no condensation)

Size and weight

  • 85(H)×43(W)×22(D)mm
  • Approx. 85 g (excluding attachment holder)

Dustproof and waterproof performance

  • IP54 (expect microphone)


  • Dedicated USB cable *1, *2
  • Dedicated windscreen
  • Alligator clip holder

*1 Allows setting for the NB-14 to be made from a computer and transfers the measurement data to the computer. The NB-14 side is a dedicated connector, the other is USB terminal (USB Type-A).

*2 A separate charger (commercially available) is required for charging. Voltage and current required for charging: 5 V, 185 mA


Sound Calibrator(NC-75)








The NC-75 is essential for pre- and post-measurement calibration.

Use it for day-to day management of the NB-14.

  • Compact and lightweight
  • High precision
  • IEC 60942 Annex B

Sound Calibrator


Would you like to start measuring noise exposure for the safety and security of workers?

Rion's noise exposure meter "NB-14"

Scheduled to be released


Noise exposure meter that satisfies the accuracy specified in "Personal Exposure Measurement"

Rion's sound calibrator "NC-75"


For checking equipment before and after NB-14 measurementNC-75

About RION

  Our company was established in 1944 to commercialize the research results of the Kobayashi Institute of Science, which aims to research physics and acoustics. We deal in "sound and vibration measuring instruments" such as measuring instruments and seismometers related to sound and vibration. Our products are used in a wide range of fields, from individuals to government offices, schools, hospitals, service industries, agriculture, forestry and fisheries, and all kinds of manufacturing industries, and have been exported to more than 60 countries around the world, receiving high praise.

  We aim to supply products that meet the needs of our customers and maintain our position as the top manufacturer in the industry. In addition, we

aim to create a safe life and a comfortable environment based on

our corporate philosophy of "Rion contributes to people, society

and the world through everything we do."

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Contact us

Feel free to contact us about anything related to sound and vibration.

Head Quarter/Factory

3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan

rion's support service logo

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