Spartan Series Firearm Noise Sound Level Meter

Firearms Acoustic Analysis | Model 821IH-QPR

Many firearm examiners are tasked with determining whether installation of a suppressor on a firearm results in a “perceptible” reduction of the sound pressure level of a gun. The Larson Davis Spartan 821IH-QPR provides this functionality utilizing an easy-to use handheld platform. Included BLE technology allows for easy measurement control using the LD Atlas mobile app or included software. Meters may also be connected via USB-C.

With the included ¼” prepolarized pressure microphone, Spartan 821IH-QPR is capable of reading levels up to 183 dB, easily capturing levels typically associated with gunfire testing. Included G4 LD Utility software provides automatic wireless or USB data download, and convenient data storage options. View tabular data, visualize results on a graph, create custom reports, and export data to a variety of formats.


  • Measure up to 183 dB
  • Class 1 Sound Level Meter
  • 48 kHz sampling rate
  • Simple setup for gunfire testing applications
  • Easy-to-navigate, responsive, touch display


  • Long battery life, up to 40 hours
  • Bluetooth BLE 4.1 wireless communication
  • Full control with LD Atlas mobile app
  • Dosimetry option included for noise exposure measurements

Key Specifications for Spartan Model 821IH-QPR

Dynamic Range (A-weighted typical)61 to 183 dB
Peak Dynamic Range (Z-weighted typical)103 to 186 dB
Time WeightingsFast, Slow, & Impulse
Frequency WeightingsA, C, & Z
Data Storage (micro SD card)8 GB standard
Up to 256 GB
Data LoggingTime history: 1 s to 1 h
Measurement History: 1 min to 6 h
MetricsLeq, Lmax, Lmin, Lpeak, Ln (6 values), Time Above



SoftwareG4 LD Utility
1/4” Microphone AdapterADP043
Charging CableUSB-C (CBL242-03)

Standards and Approvals for Series 821IH

AcousticANSI S1.4-2014 Class 1
IEC 61672-1:2013 Class 1
Noise DosimetryANSI 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

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Preliminary - specifications subject to change