For professional decibel level recording and noise monitoring.

Available to buy in the UK

01223 982912

Class 1 certification-ready USB microphone

uPrecisionMic is factory calibrated to +/-0.1dB using a NIST traceable pressure-compensated calibrator. The calibration factor for both high and low ranges are recording on the factory calibration card in dBFS, so that application software can be calibrated to provide an absolute SPL level.

Self-contained device

All of the active electronics are in the microphone body, including the microphone preamplifier using a 5 gigaOhm input impedance resistor, precision 24-bit A/D converter, and the logic circuitry required to communicate over a USB digital audio link. 

Audio Output

uPrecisionMic includes a unique USB microphone feature, an analog output. This output is available for sending audio test signals to devices being tested. The connector is a standard 1/8” (3.5mm) stereo jack. Note that the output is line level, and is not designed to drive headphones.

The output level can be set from the device that it is connected to, for example on Mac, the system preferences panel, or on Windows, the audio output control panel.

Reliable and accurate

uPrecisionMic connects to the USB host device with a USB type C connector using a 1m (39”) cable. If your device does not have a USB  C connection available, you can use any standard passive USB C - USB A or micro adapter.

Professional quality

The uPrecisionMic body is built of beautifully finished nickel-plated solid bronze tubing that is threaded to accept a standard 1/2” microphone capsule.

A microphone is only as good as its capsule, and S6D use a special hand-selected thread-on capsule with a metal diaphragm built by ACO Pacific. Every microphone ships with its own calibration graph. 

uPrecisionMic is very low noise, guaranteed to be below 18 dBA, for measuring room noise. It is also very flat, with a 3 dB roll-off below 3 Hz. The preamp self noise is typically 5 dB below the capsule noise floor.

Each microphone is tested and a frequency response graph is included with the device.


  • uPrecisionMic with USB-C connector
  • Calibration certificate and frequency response graph
  • Mini tripod and mic clip

Performance and Specifications

  • Response Characteristic Free Field response 0°
  • Omni-directional
  • Temperature Coefficient -10°C to 50°C, 0.01dB/°C
  • Influence of Humidity <+/-0.1dB (non-condensing)
  • Long Term Stability at 20° >250 years/dB
  • Dynamic Range (3% THD) 18 dBA - 109 dBA 
  • Frequency Response +/- 1dB 10 Hz - 20 kHz 
  • Fixed-USB Type C interconnect cable length 1m
  • Made in USA


uPrecisionMic is powered directly from the USB host device. It uses less than 90ma while audio is active, and much less when idle. 

It is not possible to supply power to the host device from uPrecisionMic.

Computer / USB Interface

uPrecisionMic uses the built-in standard USB audio drivers on all platforms, so no installation is required before using it. If your device does not have a USB-C connection available, you can use any standard passive USB-C to USB-A or micro adapter.

Android Interface

uPrecisionMic will work with most Android-based devices.