Larson Davis Spark® series of personal noise dosimeters and the SoundTrack LxT® Sound Level Meter offer automatic calculation of noise dose and TWA noise levels, as well as maximum and peak exposure levels, which are required to address ANSI Standard A10.46-2007. The Spark® series is also able to use an optional fixed microphone.Larson Davis, www.larsondavis.com, (888) 258-3222