Sportsman Supply Inc. Shooting Chrony 7000129 Beta Master Chronograph, Blue Measures the speed of any projectile from 30 feet per second to 7000 feet per second. Can go with you anywhere, extremely easy to transport. Made of 20 gauge steel but weighs less than 2 1/2 pounds. Powered by a single 9 volt battery. Measures speed within .5-Percent accuracy.