This Digital Noise Meter will help you to figure what noise level your car (or ICE) is generating. (no more surprises when entering track days!)
Measurements can be done in a range from 30dB to 130dB.
To be able to do a good measurement (or worst case measurement), this handy gadget records peak noise levels, it has a data hold function.

Functions like fast and slow measurement are all included.

The device is small (can be kept in your pocket) and runs from three AAA batteries (not included)