Speedar
Handheld speed measurement system, can be used anywhere that the speed of an object is to be measured, the obvious uses are measuring the speeds of cars or trucks, however it is also quite capable of measuring the speed of balls in flight and is often used for measuring the speed of kicks in football amusements and for the speed of tennis serves in matches. For this use it is vastly superior to laser speed measurement as it is almost impossible to keep a laser trained on a moving ball. Naturally it will also measure the speed of boats or trains.
Also See: Traffic Monitoring Device