Class 1 Sound Calibrator

Precision Calibrator 94/114 dB

The battery-operated Class 1 Sound Calibrator is classified for the calibration of class 1 measurement microphones, sound level meters and other acoustic measurement equipment. This precision microphone calibrator delivers 94 or 114 dB at a frequency of 1 kHz.

NTi Audio #: 600 000 388

Product Data

Add the "1/4" Calibration Adapter" to fit 1/4” measurement microphones into the Class 1 Sound Calibrator. NTi Audio #: 600 000 391

Class 2 Sound Calibrator

Klasse 2 Kalibrator
The battery-operated Class 2 Sound Calibrator is classified for the calibration of class 2 measurement microphones, sound level meters and other acoustic measurement equipment. This microphone calibrator delivers 114 dB at a frequency of 1 kHz.

NTi Audio #: 600 000 394

Product Data

Microphone PreAmplifier

MA220 Microphone PreAmplifier
The MA220 and MA230 offer a low noise microphone preamplifier compatible with standardized 1/2" microphone capsules. Both include an electronic datasheet for fast setup and ensuring accurate measurements. The MA230 is additionally enabled for periodic self-tests (System self-test CIC) dedicated for permanent noise monitoring stations.

NTi Audio #:
  • MA220: 600 040 040
  • MA230: 600 040 200

Weather Protection

Microphone Weather Protection
Protect your measurement microphone from rain, wind, dust and perching birds with a professional outdoor weather protection kit. The corrosion-free polymer housing, windscreen, water-repellent membrane and bird spike provide excellent protection from rain, wind, dust and perching birds. A weather protection is dedicated for precise acquisition of environmental noise data in outdoor applications.

There are three types available. The WP30 Weather Protection with two different sizes of windscreens (90 mm and 150 mm) is dedicated for the ½” measurement microphones M2230 and M2340. On the other hand the WP61 Weather Protection is designed for the ¼” measurement microphone M4261. An outdoor measurement microphone consists of a measurement microphone and a weather protection.

NTi Audio #:
  • WP30-90: 600 040 060 (without microphone)
  • WP30-150: 600 040 090 (without microphone)
  • WP61: 600 040 080 (without microphone)

Product Data  |  Manual

Assembly Tutorial for WP30-90 or WP30-150




Pole Mount Adapter


The outdoor measurement microphone may be installed on a pole using an adapter. The microphone is connected to the sound level meter by the ASD cable, which runs through the pole and the adapter to the microphone. The adapter is available in two different sizes.


NTi Audio #:
  • Pole Mount Adapter PM 1": 600 040 067
    supports pole diameter 25 - 33 mm (1-1.3")
  • Pole Mount Adapter PM 1 1/4": 600 040 068
    supports pole diameter 32 - 44 mm (1.25-1.75")


Dehumidifier for M2230-WP
The Dehumidifier protects the microphone capsule from possible water damage caused by condensation due to high humidity. This provides reliable and precise measurements in changing environmental conditions. The Dehumidifier is an accessory for the outdoor measurement microphone M2230-WP (= M2230 with WP30) and M2340-WP (= M2340 with WP30).

NTi Audio #: 600 040 063

Product Data

Manufacturer Calibration Certificate

Manufacturer Calibration Certificate

The calibration certificate lists the individual product data with serial number. The calibration and adjustment procedures follow the documentation and traceability requirements of the EN ISO / IEC 17025 standard.

Annual re-calibration of the instrument after the purchase is recommended ensuring accurate measurements.

NTi Audio #: 600 000 018

Sample Manufacturer Calibration Certificates:

Get more Information

Contact us for a quotation or to discuss your measurement application.

Request Quotation    Call now: +1 (503) 684-7050    Web Shop