The Larson Davis Model 831 Class 1 Sound Level Meter is a versatile instrument, which performs the functions of several instruments. It puts the combined features of a precision Class 1 sound level meter, environmental noise logger, personal noise dosimeter, and a real-time frequency analyzer in the palm of your hand. The Larson Davis Model 831 is a fifth generation Larson Davis sound level meter, designed for simple single handed operation, yet is fully featured, smart and versatile with an extensive swuite of firmware options. The design of the Model 831 was based on countless inputs from our customers. It expands upon the Larson Davis tradition of delivering value, innovation and function in a rugged single-handed expandable package and is backed by a 2-year Factory Warranty, 24-hour application support and accredited factory service/calibration.

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Included Support
Local Sales & Support
Noise Measurement Services are located in Brisbane and service Australia for sales and hire of Larson Davis equipment. We have extensive experience in the field of acoustics, and are here to help you select the best equipment for your job.
Complimentary Noise Training
We provide a complimentary Continuing Professional Development module with all instrument purchases. The module is provided by Acoustar, a Registered Training Organisation that specialises in noise training. The module awards 10 CPD points to the participant. Additional CPD and formal noise training is also available.
Complimentary Tech Support
The team at NMS have been using Larson Davis equipment for over a decade, and are always at the end of the line if you need help with your instrument. We can also provide remote assistance via Teamviewer.
Zero Down Time
We understand that 'time is money' and having your instrument out of action for months during repair or calibration is not acceptible. For instruments purchased at NMS, we will provide rental equipment for the duration of your repair or calibration with the rental fees capped at 10 days. (Subject to rental equipment availability).
Trade-in Deals
Larson Davis offer several trade-in and upgrade deals which we are more than happy to honour. We will even go a step further and offer up to 10% off the price of your new instrument when you trade-in virtually comparable product; any brand, working or not!
Local Repair & Calibration
We are authorised repairers of Larson Davis equipment and can perform many repairs in Australia without having to send your equipment overseas. All repairs are undertaken by an experienced technician using genuine parts. We can also arrange NATA calibration for your instruments at a Brisbane calibration laboratory.
IEC 61672-1:2013, ANSI S1.4, ANSI S1.43 Class 1 integrating sound level meter
Voice Annotation
User programmable run modes
Six user selectable statistics (Ln)
Threshold exceedance data
Community Noise Calculations (Lden, CNEL)
GPS Global Positioning Support
User-selectable screen layout and lockable setup protection
Wide variety of non-proprietary powering options including – 4XAA internal batteries, AC, USB and external batteries
Class 1 sound measurements to the latest international standards
Environmental noise assessment and monitoring
Reverberation time measurement and building acoustics
Occupational noise evaluation
HPD selection
Noise reduction validation
Product quality control
NVH correlation
In-Situ sound power measurements
Real-time analysis of sound in 1/1 and 1/3-octave bands
Code enforcement
Firmware Options
831-OB3 1/1 AND 1/3, Class 1, Octave Band Spectral Analysis
831-SR Sound recording to ".wav" format at 8, 16, 24 or 48kHz.
831-LOG Time history logging at periods from 20ms to 24hrs
831-FST Fast time history logging at 2.5, 5 or 10ms periods
831-ELA Automatic event detection and event history measurement history (1min to 99hr intervals) combine with 831-LOG for event time history and 831-SR for event sound recording.
831-RT Reverberation time measurement, computation and display.
831-FFT Fast Fourier Transform up to 6400 lines.
831-COMM Advanced digital communications via cellular modem.
831-MDM Analogue modem w/ RS232 connectivity.
831-WTHR Weather parameter logging in parallel with acoustic parameters.
831-IH Industrial Hygiene or personal noise dosimetry.

Training Partner
Acoustar WHS Training logo
831 User Manual
831 Brochure
Outdoor Monitoring Brochure
Related Pages
Training Videos
Sound Meter Selection Guide
Outdoor Noise Monitor Kits
831 Ordering Information
Larson Davis Page
G4 Ld Utility Software

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Handheld noise measurements
Workplace / indoor noise measurements
Room acoustics, reverberation time, FFT, etc.
Outdoor logging up to 1 week
Outdoor logging longer than 1 week
831-LOG: Time history with intervals from 20ms to 24hr
831-FST: Fast time history logging at 2.5, 5 or 10ms periods
831-OB3: Real-time 1/1 & 1/3 octave filter set
831-ELA: event, interval and daily histories logging
831-SR: Sound recording to ".wav" format at 8, 16, 24 or 48kHz.
831-RT: Reverberation time measurement, computation and display.
831-FFT: Fast Fourier Transform up to 6400 lines.
831-IH: Industrial Hygiene or personal noise dosimetry.
Camera-style tripod for attended noise measurements.
Accessory kit with hardcase, batteries, power supply, WiFi dongle, and windscreen.
Class 1 calibrator.
Basic outdoor weatherproof noise-logging kit.
Outdoor weatherproof noise-logging kit with self-calibrating microphone system, remote access via 4G modem, and indefinite operation with battery and solar panel.