Larson Davis SoundExpert 721 & 821

Want a sound level meter that works like your phone? The SoundExpert Model 821 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 821 is an excellent choice for ease of use and low power operation.

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Features
Highlights	Large, responsive touch display
	Long battery life – up to 40 hours
	IP65 rated against dust and moisture
	Automatic data download via Bluetooth or USB options
	Flexible powering options, including wireless charging
	Class 1 and Class 2 models available
Applications	Environmental noise
	City noise
	Environmental impact studies
	Construction noise
	Monitoring noisy venues

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Noise Monitoring at Your Fingertips

The SoundExpert Model 821 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.

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

Specifications for model 821ENV
Dynamic Range (A-weighted typical)	14 to 140 dB
Time Weightings	Fast, Slow, & Impulse
Frequency Weightings	A, C, & Z
Data Storage (micro SD card)	8 GB standard. Up to 256 GB
Data Logging	Time history: 100 ms to 1 h Measurement History: 1 min to 6 h
Metrics	Leq, Lmax, Lmin, Lpeak, Ln (6 values), LDN, LDEN

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Available Configurations

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

SoundExpert Sound Level Meters
Model	721ENV	721ENV-D	821ENV	821ENV-D
Class	2	2	1	1
Time History Logging
Measurement History
Community Noise Metrics
OBA (1/1 and 1/3 Bands)

Standards and Approvals for Series 821ENV
Acoustic	ANSI S1.4-2014 Class 1 IEC 61672-1:2013 Class 1
Noise Dosimetry (Optional)	ANSI S1.25-1991 IEC 61252:2017
Safety	Directive 2014/35/EU IEC 61010-1:2010 RoHS Directive 2011/65/EU
Approvals	CE, RoHS, WEEE

See the configuration guide for all accessories.

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Training Partner

Downloads
SoundExpert Data Sheet
SoundExpert Configuration Guide

Related Pages
Training Videos
Sound Meter Selection Guide
Noise Monitor Selection Guide

Links
Larson Davis Page
G4 Ld Utility Software

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