SoundExpert® Sound Level Meter

Product Noise Evaluation and Environmental Noise | Series 821ENV

Want a sound level meter that works like your phone? The SoundExpert® Model 821ENV does just that with a large touch display viewable in any condition. Whether making handheld noise measurements or measuring environmental noise for several weeks, the SoundExpert Model 821ENV is an excellent choice for ease of use and low-power operation.

SoundExpert is also available in a Class 2 version, SoundExpert Model 721ENV. Please see Configurations below or download the datasheet for more details.


  • Large, responsive touch display
  • Long battery life – up to 40 hours
  • Automatic data download via Bluetooth or USB options
  • Flexible powering options, including wireless charging
  • Languages supported: English, Français, Italiano, Português, Español


  • Environmental noise
  • City noise
  • Environmental impact studies
  • Construction noise
  • Monitoring noisy venues

Noise Monitoring at Your Fingertips

set up time history, oba, etc.The SoundExpert Model 821ENV in its basic form includes the essentials for measuring noise by providing:

  • A, C, and Z frequency weightings
  • F, S, and I time weightings
  • Full-featured data logging

Using the included G4 LD Utility software, data can be downloaded, visualized, manipulated, and exported to a variety of formats, including Microsoft Excel® .xlsx.

For more advanced applications, options such as 1/1 or 1/3 octave filters for frequency analysis are available. When protection and extra power are needed for unattended outdoor noise measurements, choose from a variety of protective cases with batteries, solar power, and grid/mains power capabilities. SoundExpert Noise Monitoring System Model NMS048 is available as a complete outdoor noise monitoring kit.

The SoundExpert Sound Level Meter Model 821ENV, together with Larson Davis quality and customer support, delivers a professional solution you can trust.

Key Specifications for SoundExpert Model 821ENV

Dynamic Range (A-weighted typical)17 to 140 dB
Time WeightingsFast, Slow, & Impulse
Frequency WeightingsA, C, & Z
Data Storage (micro SD card)8 GB standard
Up to 256 GB
Data LoggingTime history: 100 ms to 1 h
Measurement History: 1 min to 6 h
MetricsLeq, Lmax, Lmin, Lpeak, Ln (6 values), LDN, LDEN

call about other firmware options

Available Configurations

SoundExpert Sound Level Meter is available as a Class 1 or Class 2 device and with or without Octave Band Analysis.

Time History Logging
Measurement History
Community Noise Metrics
OBA (1/1 and 1/3 Bands)  


Microphone377B02 (821 Models)
375A04 (721 Models)
PreamplifierPRM821 (821 Models)
PRM721 (721 Models)
SoftwareG4 LD Utility
Charging CableUSB-C (CBL242-03)
Preamplifier extension cablesEXC series
See Configuration Guide for Optional Accessories


Standards and Approvals for Series 821ENV

AcousticANSI S1.4-2014 Class 1
IEC 61672-1:2013 Class 1
Noise Dosimetry (Optional)ANSI S1.25-1991
IEC 61252:2017
SafetyDirective 2014/35/EU
IEC 61010-1:2010
RoHS Directive 2011/65/EU
ApprovalsCE, RoHS, WEEE


Technical Support

  • 24 Hour Hotline 716-926-8243
  • Toll-Free (US & Canada Only) 888-258-3222

Product Warranty Information

Resources & Education

For more articles, videos, and Tech Talks, visit our Education Portal

Preliminary - specifications subject to change