MagnetoSpeed Sporter Chronograph Kit The MagnetoSpeed Sporter Chronograph Kit Was Designed To Be Used On Barrels From 1/2 Inch Up To 1 Inch In Diameter. In Can Also Accommodate Muzzle brakes, Flash hiders, Etc, Up To 2.7 inches In Length. Ideal For contoured Rifle Barrels (Sporter Barrels) And Long-Barreled Revolvers. Features: - Simple, One-Button Cycling Display (shows Recent Shot Velocity And statistics, Plug In To Turn On) - Battery : 9-Volt (Included) - Easy Access Battery Compartment, No Need For Screwdriver To Swap Batteries - Three Sensitivity settings For Fine-Tuning - Integral, Quick-Attach Strapping System; With Metal Buckle And Triad Thumb Nut - Proven Technology With updated Sensor Design - Integral 3.5 Foot Sensor Cord Includes: - Display Unit - Bayonet-Style Sensor (Bayo) - Thick And Thin Rubber V-Block Spacers - Heavy Duty Strap With Thumb Nut Tightener - Ultra-Compact Storage Container. Manufacturer: MagnetoSpeed Manufacturer Number: Upc: 855036004054