"Take the barrel-mounted MagnetoSpeed V3 Ballistic Chronograph to the range and easily record your rifle's ballistics. It works on barrels and suppressors 0.5"" to 2"" in dia. and has additional clearance in the blast zone to account for barrels with a muzzle brake or flash hider up to 3"" long. 3-button menu system for simple navigation. Screen displays your ballistic information and rate of fire. Improved shooting modes includes compatibility with air guns. Advanced data logging and troubleshooting capabilities. Bayonet sensor attaches to your barrel with a strap, metal buckle, and triad thumb nut. Dual data connection points and downloadable firmware updates available. Also includes retractable cable, 6' cable, stainless steel blast shield, V-block spacers, micro SD card with adapter, polymer spacer kit with hardware, Allen wrench, and alignment rod. Uses one 9-volt battery (included). The MagnetoSpeed V3 Ballistic Chronograph comes packaged in a convenient hard case with custom-cut foam for easy transport and safe storage. Manufacturer model #: MS_V3_HC. Easy-to-use barrel-mounted chronograph Works on barrels or suppressors up to 2"" in dia. Blast-zone clearance accounts for muzzle brakes Screen displays ballistics and rate of fire Upgraded system is compatible with air guns Comes packed in a padded hard case for easy transport"