Providing a reliable and efficient way to monitor and address noise complaints. The LD-NNR kits is designed for ease of use, allowing environmental health officers to capture high-quality audio recordings...

Key Product Features

Model: 821

Colour Touch Screen Display

Class 1 Certified Sound Level Meter

Accessible Hand Trigger

1/1 & 1/3 Octaves

Wireless Charging

Simple to Use

40 Hr Battery Life

32-bit High Quality Sound Recording

Data Logging 100 ms to 1 h

Environmental Mode

Free G4 Utility Reporting Software

Atlas App iPhone or Android

Automatic Calibration

Experience hassle-free calibration with the fully automated system. Simply insert the microphone, and the meter takes care of the rest, adjusting, calibrating, and logging each calibration interval. Stay confident with a complete calibration history, effortlessly maintained for you.

Effortless Operation – Here’s Why!

Effortlessly navigate with the intuitive colour touchscreen – preloaded with essential features and zero complicated settings. A crisp, responsive display with USB-C & wireless charging. A true smartphone like device.

G4 Utility 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.

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Easy Fast & Ready Reports

Generate professional reports effortlessly with G4 Software. Its intuitive interface streamlines the reporting process, allowing you to create comprehensive PDF reports in just a few clicks. Whether you're analysing noise data, vibration levels, or environmental metrics, G4 makes it easy to present your findings clearly and professionally – saving you time and ensuring accuracy.

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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

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Precision Noise Monitoring with Larson Davis – Record, Report, Resolve

Designed to capture and log nuisance noise with precision, this recorder provides clear, time-stamped evidence to support enforcement and dispute resolution.

With high-quality data storage at a budget-friendly price, you get the accuracy you need without breaking the bank. Simplify noise monitoring and take control of your investigations today.

Accessibility Friendly Hand Trigger

Inclusive design allows people with various physical limitations to operate the device. Those with limited dexterity, strength, or mobility in their hands can still document noise disturbances affecting their quality of life.