SoundExpert® 821
Portable sound level meter designed for accurate acoustic measurement in various environments, including industrial and environmental settings. Known for its ease of use and durability, it features Class 1 precision,...
Key Product Features
Model: 821
Class 1
Touch Screen
2 Year Device Warranty
5 Year Microphone Warranty
Up to 40 Hours
Time & Measuremnt History
Wireless Charging & USB-C
Back-Erase
Audio Recording
Wireless Connectivity
Environmental Logger
Smartphone App Control & Reporting
Community Noise Metrics LDEN, LDN
Dosimeter Mode
NR NC RC Room Acoustics
G4 Free Reporting Software
Dosimetry Mode: Effortless Noise Monitoring
Easily assess workplace noise exposure with Larson Davis dosimeters. The intuitive Dosimetry Mode simplifies data collection, allowing you to monitor, log, and report employee noise levels with precision. Designed for quick setup and reliable results, it ensures compliance with occupational noise standards while keeping workers protected.
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Power That Lasts: The SoundExpert's Long-Life Battery
Room acoustics refers to how sound behaves within an enclosed space. It involves analysing how sound waves reflect, absorb, diffuse, and transmit within a room. The primary focus is to assess how sound interacts with surfaces (walls, ceilings, floors) and objects in the space to ensure optimal auditory experiences, reduce noise, and prevent echo or reverberation.
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Visual Convenience: Accurate Identification
Obtain real-time 1/1 and 1/3 octave band data, allowing you to isolate and identify specific noise frequencies for targeted mitigation strategies.
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Feature Rich Settings. & Sound Recording
Adjust your settings to suit your measurement with frequency weighting and time history settings. Crystal-clear recordings can be triggered by exceedance levels, external controls, or a preset trigger, while the pre-trigger function allows you to capture the moments leading up to a noise breach for precise analysis.
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Fully Customisable Event Triggers
Leveraging the instrument’s expansive dynamic range and 32-bit audio capability, the system captures high-resolution, distortion-free audio, even during intense noise events. The session logs details the events & audio recordings by the meter.
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G4 Utility Reporting Software
The G4 LD Utility is free software for all compatible Larson Davis meters, enabling you to connect, control, and view data from your device.
Organise files by project, view data in graphs or spreadsheets, and export reports.
Analyse multiple parameters, visualise heat maps, and, for meters with sound recording, play synchronised audio and edit data directly from the graph.
Atlas™ – Mobile App
Your smartphone can now become the keypad and display for the SoundExpert via Bluetooth.
- Manage instrument setups
- Run and stop measurements
- View data except 1/1 and 1/3 octave data
- Manage Wi-Fi connections
- Calibrate and check calibration
- View files
- Schedule measurements
Experience Precision with the Larson Davis SoundExpert
Its user-friendly interface and sharp, high-resolution display deliver instant clarity and effortless navigation, saving you valuable time in the field. The lightweight design and comfortable hand grips allow for easy, single-handed operation, making quick measurements a snap.
Noise Nuisance Recorder Kit
Providing a reliable and efficient way to monitor and address noise complaints. The Larson Davis Noise Nuisance Kit is designed for ease of use, allowing environmental health officers to capture high-quality audio recordings and precise noise level data, helping them gather robust evidence for investigations. Its remote operation and tamper-proof design ensure accurate and secure data collection, while intuitive software simplifies analysis and reporting. With growing concerns over noise pollution affecting communities, this recorder enables councils to enforce regulations effectively, improve response times, and support residents in resolving nuisance complaints efficiently.
SoundExpert® – Class 1 Noise Nuisance RecorderAtlas Smartphone App: Control, Manage, Report
Easily manage instrument setups, start and stop measurements, view collected data, manage Wi-Fi connections, perform calibration checks, browse stored files, and schedule measurements, all from one platform.
LD Atlas™ – Mobile App
Key Product Specifications
Percentiles & Markers
100 ms to 1 h Measurement Intervals
Leq, Lmax, Lmin, Lpeak, Ln (6 values), LDN, LDEN
17 to 140 dB Dynamic Range
A, C, and Z Frequency Weightings
Fast, Slow, & Impulse Time Weights
Up to 256 GB Micro SD
IEC 61672-1:2013 Class 1, IEC 61252:2017, ANSI/ASA S12.2-2019
Qi Wireless, USB-C, or external 12 V
Leq, Lmax, Lmin Third & Octave Metrics
1/1: 8 Hz to 16 kHz, 1/3: 6.3 Hz to 20 kHz
Weight 383 g
Optional Software Upgrades
Product Accessories
Every product needs flexibility to do whatever you want it to.
Download Datasheet
CAL1200 Field Calibrator
Environmental Kit
721 Field Free Microphone
LD-375A04
721 Preamplifier
LD-PRM721
821 Preamplifier
LD-PRM821
821 Free-field Microphone
LD-377B02
Windshield
LD-WS001
Screen Protector
LD-X21-SP
USB-C Cable
LD-CBL242-03
Outdoor Microphone Protection
LD-EPS2116
Weatherproof Environmental Case
LD-EPS048
21 Ah Battery
CA-5502
Internal Lithium Battery
LD-BAT026
Bare End Power Cable
LD-CBL226-1/2
12 V power cable for 721 and 821
LD-CBL241-01
Hard shell shipping and carrying case
LD-CCS060
Qi charger pad
LD-PSA046
Mounting Tripod
LD-TRP025
Mini Tripod
CA-4001A
Class 1 Accessory Kit
LD-X21-ACC
Class 2 Accessory Kit
LD-X21-ACC1
8 GB, industrial grade microSD memory chip
LD-X21-SD-8GB
32 GB, industrial grade microSD memory chip
LD-X21-SD-32GB
Environmental Case
LD-EPS048-ALK
Monopole with Superclamp
LD-EPS048-OPT3
2 m Microphone Extension Cable
LD-EXC006
3 m Microphone Extension Cable
LD-EXC010
6 m Microphone Extension Cable
LD-EXC020
8 m Microphone Extension Cable
LD-EXC025
11 m Microphone Extension Cable
LD-EXC035
15 m Microphone Extension Cable
LD-EXC050
20 m Microphone Extension Cable
LD-EXC066
30 m Microphone Extension Cable
LD-EXC100
61 m Microphone Extension Cable
LD-EXC200
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Guides & Downloads Email SupportFrequently Asked Question's
What makes this sound level meter suitable for professional use in the UK?
This sound level meter meets IEC 61672-1:2013 requirements, making it suitable for environmental monitoring, workplace compliance, and legal noise assessments in the UK.
It provides accurate measurements such as Leq, Lmax, and Lmin, ensuring dependable results for professional applications.
What noise measurements and frequency analysis features are included?
The device measures Leq, Lmax, Lmin, Lpeak, and Ln values, along with third octave and octave band analysis for detailed acoustic insight.
It also supports A, C, and Z frequency weightings and covers a wide frequency range from 6.3 Hz to 20 kHz.
What dynamic range and measurement settings does the device offer?
With a 17 dB to 140 dB dynamic range, this meter is suitable for everything from low-level background noise to high-level industrial environments.
It also supports measurement intervals from 100 ms to 1 hour and includes Fast, Slow, and Impulse time weightings for flexible monitoring.
How is measurement data stored and analysed?
The device supports up to 256 GB of microSD storage, making it ideal for long-term monitoring.
Features such as time history, percentiles, and markers allow users to analyse trends, identify noise events, and maintain detailed records for reporting and compliance.
How does G4 software support noise measurement and reporting?
G4 reporting software provides advanced tools for analysing and visualising noise data.
Users can generate professional reports, review trends, and manage measurement data efficiently for environmental and occupational noise assessments, helping streamline compliance and documentation.
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