The NIOSH Sound Level Meter (SLM) app combines the best features of professional sound level meters and noise dosimeters into a simple, easy-to-use package. The app is designed to measure noise exposure in the workplace. The app helps workers make informed decisions about their noise environment and promote better hearing health & prevention efforts. 

Key Features

• Developed by experienced acoustics engineers and hearing loss experts.
• Tested and validated (accuracy ± 2 dBA) according to standards in a reverberant chamber at the NIOSH acoustics lab – the only proper method to validate accuracy.
• Meets Type 2 requirements of IEC 61672:3 SLM standard when used w/ external microphone.
• Provides the most relevant metrics found in professional sound instruments today. Averages such as LAeq and TWA, Max and Peak Levels, Noise Dose and Projected Dose according to NIOSH and OSHA standards, and all three major weighting networks (A, C, and Z).
• Up-to-date informational screens on what noises are considered hazardous, how to conduct a noise measurement, how to properly select a hearing protector, and guidelines for preventing hearing loss.
• Technical support available directly from NIOSH hearing experts.

Washinghton January 30, 2019 - NIOSH released an updated version of its free Sound Level Meter app. The update includes new information on how to conduct a noise survey and select proper hearing protection. The agency also has improved the app’s help screens, NIOSH announced announced Jan. 23 via Twitter.

Along with sharing and reporting data, the app has the capability to calibrate an internal or external microphone.

The NIOSH Sound Level Meter is available to download from the Apple App Store. For Android users, the agency states that because of the large number of available Android devices and models, “testing and verification of the accuracy and functionality of an Android-based app in our laboratory is not currently possible.”