Techsial Android Extreme Tech Arena is offering this app with following features:

Speed meter, which measures the speed of a vehicle in km/h (kilometer per hour). You can use this speed test app just in seconds it is very simple and easy to use, only you need to do is set the maximum speed of a vehicle and the app will help you and warn you when you reach to maximum speed you set. This speedometer gives you an audio message “slow down” for slowing down your speed when you exceed your limit, this speed test app also warns by the speedometer pointer indicating toward red this is indicated only when you exceed the vehicle speed limit.This speed meter also has a compass feature. Compass will help you in searching and be finding your direction and degrees from north.
Speed meter / Over Speed Checker also have a calculator feature to calculate mileage, distance and fuel.