Check the speed of bows, airsoft guns, and authentic firearms using the Chrony Chronograph Gamma Master. Mount the chronograph on a tripod or table. The chronograph displays the speed of projectiles firing from 30 to 7,000 feet per second. The Chrony also measures firepower at a rate of 1,800 rounds per minute. The 1/2-inch digital display provides the results, which remain visible until the next shot. The unit also has a 500-shot memory and keeps track of the time that elapses between shots.