The MagnetoSpeed V3 barrel-mounted ballistics Chronograph kit was designed to be used on barrels and suppressors from 1/2 inch all the way up to 2 inches in diameter. In addition to the larger diameter tolerance, the V3 also has one inch more clearance in the blast zone than previous models to account for longer muzzle brakes and flash hiders. In most cases, the clearance accounts for up to an additional 3 inches for extended muzzles. <br><br> Our improved display includes a user friendly three-button menu system. With easy access to the battery compartment, there is no need for a screwdriver to swap out batteries when they are needed so you can change them on the go. Our display system also allows for two different battery types, either a single 9-Volt battery can be used or two CR123 batteries. We have upgraded and improved our shooting modules, which now allows your V3 display system the ability to operate with air guns. Downloadable firmware updates and advanced data logging allow for sharper focus down the barrel rather than monitoring the display. A more compact and rugged display housing, as well as the included hardcase means you can take your kit anywhere you want to go. The redesigned bayonet and rapid mode setting with rate-of-fire means you can monitor your speed whether you are at an indoor range or outdoors. <br><br> The MagnetoSpeed V3 Kit includes: <br> Display Unit <br> Bayonet sensor <br> MicroSD card with adapter <br> Stainless steel blast shield <br> Retractable connection cable <br> Standard 6-foot connection cable <br> Both thick and thin rubber V-block spacers <br> Polymer spacer kit with screw hardware and Allen wrench <br> Heavy-duty strap with thumb nut tightener <br> Alignment rod <br> Hardcase with custom foam cutouts <br> Instruction manual <br><br> Please Note: For use with V3 displays, you must first update your firmware to version V.3.0.03