NSRT_mk4_Dev
296.00 $
New microphone with
extended dynamic range
Sound level meter datalogger with a dust-protected class 1 digital MEMS microphone, an accurate date/time clock, a non-volatile 128 Mb recording memory and wireless connectivity with fast USB and WiFi download.
The NSRT_mk4_Dev is a sound level meter with a dust-protected type I digital MEMS microphone and USB connectivity. This instrument is similar to the NSRT_mk4 in form, function and performance but is aimed at developers and OEMs.
DESIGNED FOR DEVELOPERS & OEMs
The NSRT_mk4_Dev connects to a host via USB and is driven by your custom application:
- • Open Virtual Com Port (VCP) protocol — fully documented
- • Tested on Windows, Linux, Raspberry Pi & any USB CDC-class platform
- • Community drivers: Python (PyPI), Rust (GitHub), LabVIEW
→ An expert can help you plan your integration (it's free)
The Sound Level Meter Data Logger NSRT_mk4_Dev is similar to the NSRT_mk4 in form, function and performance, but has been redesigned with developers in mind. This instrument is designed to be used while connected to a host such as a Raspberry Pi. In such applications the NSRT_mk4_Dev is driven by a custom application. Such application can easily configure the instrument read its data in real-time, and perform other custom functions as intended by the developer. The NSRT_mk4_Dev cannot be used in standalone mode.
The main differences between the NSRT_mk4 and the NSRT_mk4_Dev are:
- The NSRT_mk4_Dev does not have a battery. It is meant to be used while connected to a host and powered by the host’s USB port.
- The NSRT_mk4_Dev does not have any non-volatile memory. It is intended to be connected to a host and driven by a custom application. Such application will use the host’s non-volatile memory as the situation requires.
- The NSRT_mk4_Dev offers a Virtual Com Port interface (through its USB connection) for communication with the host. The communication protocol is open and documented.
- The NSRT_mk4_Dev has been tested on Windows and Linux. It will work on any platform that provides a generic USB CDC-class driver.
The NSRT_mk4_Dev has an optional Audio USB Interface. Through that interface, the instrument is seen as a USB microphone, and its audio signal can be captured in real-time. Unlike a typical USB microphone, the audio signal that the instrument streams is weighted and calibrated in Pa.
Note: The Virtual Com Port interface, and the USB-Audio interface are not mutually exclusive. They can be used simultaneously.
Sound Level Meter Data Logger NSRT_mk4_Dev Applications
- Sound level and acoustic dose measurement and recording.
- Monitoring of safe working conditions.
- 24/7 noise monitoring on construction sites.
- Activity detection and logging.
- Long-term measurement and recording of acoustic levels for environmental impact studies.
- Specially designed for long-term outdoors applications.
✔️ Get help choosing between NSRT_mk4_Dev and NSRTW_mk4_MQTT
✔️ Discuss VCP protocol integration and platform compatibility
✔️ Call us now or get email response within 24h
In stock (can be backordered)
For an open internet protocol, see NSRTW_mk4_MQTT
An optional Audio USB Interface is available for this product.
The NSRT_mk4 series is designed to work outdoors. Consult the Mounting Directions.
Key Features
Class 1 Precision
Type I compliant sound level meter with digital MEMS microphone
Open USB Protocol (VCP)
Fully documented Virtual Com Port interface, works on Windows, Linux, Raspberry Pi and any USB CDC-class platform
Ultra-Compact (50g)
Only 50 g and 19×42×160 mm — easily embedded within monitored equipment or attached to a Raspberry Pi host
Outdoor Ready
Dust-protected weatherproof enclosure with ePTFE membrane for long-term outdoor installations
Product Description
The Sound Level Meter Data Logger NSRT_mk4_Dev is similar to the NSRT_mk4 in form, function and performance, but has been redesigned with developers in mind. This instrument is designed to be used while connected to a host such as a Raspberry Pi. In such applications the NSRT_mk4_Dev is driven by a custom application. Such application can easily configure the instrument, read its data in real-time, and perform other custom functions as intended by the developer. The NSRT_mk4_Dev cannot be used in standalone mode.
The main differences between the NSRT_mk4 and the NSRT_mk4_Dev are:
- The NSRT_mk4_Dev does not have a battery. It is meant to be used while connected to a host and powered by the host's USB port.
- The NSRT_mk4_Dev does not have any non-volatile memory. It is intended to be connected to a host and driven by a custom application. Such application will use the host's non-volatile memory as the situation requires.
- The NSRT_mk4_Dev offers a Virtual Com Port interface (through its USB connection) for communication with the host. The communication protocol is open and documented.
- The NSRT_mk4_Dev has been tested on Windows and Linux. It will work on any platform that provides a generic USB CDC-class driver.
The NSRT_mk4_Dev has an optional Audio USB Interface. Through that interface, the instrument is seen as a USB microphone, and its audio signal can be captured in real-time. Unlike a typical USB microphone, the audio signal that the instrument streams is weighted and calibrated in Pa.
Note: The Virtual Com Port interface, and the USB-Audio interface are not mutually exclusive. They can be used simultaneously.
NSRT_mk4_Dev Applications
- Sound level and acoustic dose measurement and recording
- Monitoring of safe working conditions
- 24/7 noise monitoring on construction sites
- Activity detection and logging
- Long-term measurement and recording of acoustic levels for environmental impact studies
- Specially designed for long-term outdoors applications
Developer Integration
The NSRT_mk4_Dev communicates with a host via an open Virtual Com Port (VCP) interface over USB. The protocol is fully documented, allowing you to configure the instrument, stream real-time data, and build custom applications.
Virtual Com Port (VCP) Protocol
The instrument appears as a standard serial port on any platform with a USB CDC-class driver. The open, documented protocol allows your application to configure measurement parameters, read data in real-time, and perform field calibration.
USB Audio Interface (Optional)
With the optional Audio USB Interface, the instrument is seen as a USB microphone. The streamed audio signal is weighted and calibrated in Pa — unlike a typical USB microphone. VCP and USB-Audio can be used simultaneously.
Multi-Platform Support
Tested on Windows and Linux (including Raspberry Pi). Compatible with any platform that provides a generic USB CDC-class driver — including MacOS and embedded Linux systems.
Measurement Output
Provides L instantaneous (exponentially averaged) and LEQ values with A, C, and Z weighting curves. 2048-point real-time power spectrum available for frequency analysis.
Community Drivers & Resources
- Python driver — Raspberry Pi demo code by Xander Hendriks (PyPI)
- Rust driver — by Brandon Weeks (GitHub | crates.io)
- LabVIEW example — LabVIEW 18 example to exercise various instrument functions (Download)
→ Download the full VCP Communication Protocol Documentation (PDF)
Talk to an expert
Which Model to Choose?
| Feature | NSRT_mk4 | NSRT_mk4_Dev ★ | NSRTW_mk4 | NSRTW_mk4 MQTT |
|---|---|---|---|---|
| Connectivity | USB only | USB only (VCP) | USB & WiFi | USB & WiFi |
| Open Protocol | No | Yes (VCP over USB) | No | Yes (MQTT over WiFi) |
| Battery | 7-day rechargeable | No battery — USB powered | 7-day rechargeable | 7-day rechargeable |
| Recording Memory | 128 Mb non-volatile | No memory — uses host storage | 128 Mb non-volatile | 128 Mb non-volatile |
| Values Measured | Lpeak, Lmin, Lmax, LEQ | L instantaneous, LEQ | Lpeak, Lmin, Lmax, LEQ | Lpeak, Lmin, Lmax, LEQ |
| Platform Support | Windows | Windows, Linux, Raspberry Pi, MacOS | Windows | Windows |
| Audio USB Interface | Included | Optional | Included | Included |
| Weight | 93 g | 50 g | 93 g | 93 g |
| Best For | Standalone logging with local download | Developers & OEMs building custom USB-connected systems | WiFi projects with CI Cloud | OEMs integrating via MQTT |
Clients Use the NSRT_mk4_Dev For:
RASPBERRY PI & EMBEDDED SYSTEMS
"Connected to a Raspberry Pi host, it runs our custom noise monitoring application 24/7"
→ Industries: IoT Developers, Smart Infrastructure, Research Labs
OEM PRODUCT INTEGRATION
"We embed the NSRT_mk4_Dev into our own measurement product — its 50g form factor fits perfectly"
→ Industries: OEM Manufacturers, Test & Measurement, Industrial Equipment
CUSTOM MEASUREMENT PLATFORMS
"The open VCP protocol lets us stream calibrated audio data directly into our analysis software"
→ Industries: Acoustics Consulting, Environmental Studies, Academic Research
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Super fast delivery
Very fast service. Product works exactly as advertised.