NIOSH Sound Level Meter is a free, full-version app designed for iPhone owners. This award-winning app has been developed by experienced acoustics engineers and hearing loss experts. It combines the best features of professional sound level meters and noise dosimeters into a simple, easy-to-use package. The app has been tested and validated according to standards in a reverberant chamber at NIOSH acoustics lab, ensuring accuracy of ±2 dBA.

NIOSH Sound Level Meter provides the most relevant metrics found in professional sound instruments today. It includes 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). The app also has the capability to calibrate either internal or external microphones, with reporting and sharing data features.

The app includes 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. It also provides excellent and timely support from NIOSH hearing experts and supports Apple's Health (Hearing) app. Overall, NIOSH Sound Level Meter is an excellent tool for anyone interested in measuring noise levels and preventing hearing loss.