The South African-made speed gun, developed by Somerset West inventor Henri Johnson, was formally launched at The Oval in England during the 1999 Cricket World Cup. In 1992, Johnson invented the SpeedBall, which was manufactured by South African firm Electronic Development House. Using doppler radar technology, the device accurately measures the speed and angles of speeding objects, such as cricket and tennis balls, and is used in tournaments around the world to track the ball from when it leaves the bowler's hand until it hits the bat, pad, or goes to the wicket keeper. Generally referred to as a speed gun, Johnson's gizmo is sold in cricketing countries and in the U.S. and Europe. Johnson's products have also been used in the PGA and Davis Cup Events.