Decibel Ultra!

Decibel Ultra - Would you like to know how loud is your music or your TV- Or is your neighbour to loud? With Decibel Ultra you know it - Decibel Ultra measures the volume and helps you figure out how big the noise level compared to reference values.- Calibrate with Decibel Ultra all your surround speakers to the same level. The ad-free version is called Decibel Ultra pro here in the iTunes Store.