Noise Meter +

This app is primarily used to measure sound level of surroundings. It contains the following features:
1) Plot the measured data in real time.
2) Measurement duration and measurement frequency are customizable.
3) Users could set alert value to some level (Ex. 70 dB). When the measured sound level exceeds the alert value, it will alert users.
4) The location information of the measurement points could also be obtained, and all the measurement results could be shown in map.
5) All measured data could be exported as a csv format file for post process.
6) In addition, users could also add photos, videos and voice notes to the measured data, and the photos, videos and voice notes could be downloaded via iTunes.