NSRT_mk4_Spark
356.00 $
New microphone with
extended dynamic range
The NSRT_mk4_Spark is a sound level meter with a dust-protected type I digital MEMS microphone and USB and UART connectivity. This instrument is similar to the NSRT_mk4_Dev in function and performance but is designed to be easily interfaced with small microcontroller-based hosts and mounted on a custom enclosure.
The Audio USB Interface is included in this product.
The NSRT_mk4 series is designed to work outdoors.
DESIGNED FOR ENCLOSURE INTEGRATION
The NSRT_mk4_Spark is built for mounting inside your own enclosure:
- • USB + UART connectivity — interfaces with microcontrollers and Raspberry Pi
- • Ultra-compact (30g, Ø30mm) — mounts with gasket & nut on enclosure face
- • Epoxy-potted construction — resilient to long-term outdoor exposure
→ An expert can help you plan your integration (it's free)
The Sound Level Meter Data Logger NSRT_mk4_Spark is similar to the NSRT_mk4_Dev in function and performance, but has been redesigned to facilitate integration into the developer’s enclosure, as well as interfacing with small microcontroller-based hosts. This instrument is designed to be used while connected to a host such as a Raspberry Pi, or even microcontroller. In such applications the NSRT_mk4_Spark is driven by a custom application. Such application can easily configure the instrument read its recorded data, and perform other custom functions as intended by the developer. The NSRT_mk4_Spark cannot be used in standalone mode.
The main differences between the NSRT_mk4_Dev and the NSRT_mk4_Spark are:
- The NSRT_mk4_Spark is much smaller than the NSRT_mk4_Dev. It is designed to be mounted on the face of an enclosure using gasket and nut.
- The NSRT_mk4_Spark has a construction potted in epoxy, so it is more resilient to long term exposure to the elements.
- The NSRT_mk4_Spark offers a physical UART connection, to interface with small microcontroller-based hosts. This is in addition to the USB connection, so the user/developer can choose.
- The NSRT_mk4_Spark has its connectors exiting inside the enclosure for easier wire routing and weatherproofing.
Unlike the NSRT_mk4_Dev, the NSRT_mk4_Spark has an included 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 that the audio stream is only available on the USB connector. It is not available on the UART port.
Sound Level Meter Data Logger NSRT_mk4_Spark 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_Spark and NSRT_mk4_Dev
✔️ Discuss UART/USB integration and enclosure mounting
✔️ Call us now or get email response within 24h
In stock (can be backordered)
Key Features
Class 1 Precision
Type I compliant sound level meter with digital MEMS microphone — IEC 61672 precision requirements
USB + UART Connectivity
Dual interface with open protocol — USB (VCP) for computers and UART for small microcontroller-based hosts
Ultra-Compact (30g)
Only 30 g, Ø30 mm × 87 mm — mounts on enclosure face with gasket & nut, connectors exit inside for clean wiring
Epoxy-Potted & Outdoor Ready
Potted weatherproof construction with ePTFE membrane — more resilient than standard enclosures for long-term exposure
Product Description
The Sound Level Meter Data Logger NSRT_mk4_Spark is similar to the NSRT_mk4_Dev in function and performance, but has been redesigned to facilitate integration into the developer's enclosure, as well as interfacing with small microcontroller-based hosts. This instrument is designed to be used while connected to a host such as a Raspberry Pi, or even a microcontroller. The NSRT_mk4_Spark cannot be used in standalone mode.
The main differences between the NSRT_mk4_Dev and the NSRT_mk4_Spark are:
- The NSRT_mk4_Spark is much smaller than the NSRT_mk4_Dev. It is designed to be mounted on the face of an enclosure using gasket and nut.
- The NSRT_mk4_Spark has a construction potted in epoxy, so it is more resilient to long term exposure to the elements.
- The NSRT_mk4_Spark offers a physical UART connection, to interface with small microcontroller-based hosts. This is in addition to the USB connection, so the user/developer can choose.
- The NSRT_mk4_Spark has its connectors exiting inside the enclosure for easier wire routing and weatherproofing.
Unlike the NSRT_mk4_Dev, the NSRT_mk4_Spark has an included 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 that the audio stream is only available on the USB connector. It is not available on the UART port.
NSRT_mk4_Spark 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_Spark communicates with a host via USB (VCP) or UART. The open, documented protocol is the same for both interfaces, giving you flexibility to choose the best connection for your project.
Dual Interface: USB + UART
Choose USB (Virtual Com Port) for computers and Raspberry Pi, or UART for direct connection to microcontrollers (Arduino, ESP32, STM32, etc.). Both use the same open, documented protocol.
Enclosure Mounting
The cylindrical form factor (Ø30 mm, thread 24mm×1.5mm) is designed to mount through a panel with gasket and nut. Connectors exit inside the enclosure for clean wiring and weatherproofing.
USB Audio Interface (Included)
The instrument is seen as a USB microphone. The streamed audio signal is weighted and calibrated in Pa. Note: the audio stream is only available on USB, not on UART.
Epoxy-Potted Construction
Unlike the NSRT_mk4_Dev's standard enclosure, the Spark is potted in epoxy for superior resilience to moisture, temperature extremes, and long-term outdoor exposure.
Community Drivers & Resources
- Python driver — Raspberry Pi demo code by Xander Hendriks (PyPI)
- Same open protocol as NSRT_mk4_Dev — existing integrations are compatible
→ Download the full Communication Protocol Documentation (PDF)
Which Model to Choose?
| Feature | NSRT_mk4_Dev | NSRT_mk4_Spark ★ | NSRTW_mk4 MQTT |
|---|---|---|---|
| Connectivity | USB only (VCP) | USB (VCP) + UART | USB & WiFi (MQTT) |
| Form Factor | Standard enclosure (19×42×160 mm) | Cylindrical, panel-mount (Ø30×87 mm) | Standard enclosure (19×42×160 mm) |
| Weight | 50 g | 30 g | 93 g |
| Construction | Weatherproof enclosure | Epoxy-potted — superior outdoor resilience | Weatherproof enclosure |
| Audio USB Interface | Optional | Included | Included |
| Microcontroller Interface | No (USB only) | Yes — physical UART | No (WiFi only) |
| Connector Routing | External | Inside enclosure | External |
| Best For | USB-connected Raspberry Pi / computer projects | OEM enclosure integration & microcontroller-based systems | Wireless IoT platforms via MQTT |
Talk to an expert
Clients Use the NSRT_mk4_Spark For:
CUSTOM ENCLOSURE & OEM PRODUCTS
"We mount the Spark on our enclosure face — the gasket/nut system and internal connectors make weatherproofing easy"
→ Industries: OEM Manufacturers, Industrial Equipment, Environmental Stations
MICROCONTROLLER-BASED SYSTEMS
"The UART interface lets us connect directly to our ESP32 — no USB host needed, just wire it up"
→ Industries: IoT Developers, Embedded Systems, Smart Infrastructure
LONG-TERM OUTDOOR MONITORING
"The epoxy-potted construction survives years outdoors — much more resilient than a standard plastic enclosure"
→ Industries: Environmental Consulting, Construction, Smart City
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