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The MagnetoSpeed V3 ballistic 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 to account for longer (up to 3" in most cases) muzzle brakes, flash hiders, etc.MagnetoSpeed V3 features an improved designed with the following features:Improved DisplayThree-button menu systemBattery options are; (1) 9-Volt or (2) CR123sEasy access battery compartment, no need for screwdriver to swap batteriesImproved shooting modes, with the ability to now operate with air gunsDownloadable firmware updatesAdvanced data logging and troubleshooting capabilitiesMore compact and rugged display housingRapid mode with rate-of-fireRedesigned BayonetRugged strapping system; with metal buckle and triad thumb nutProven technology with updated sensor designNew profile and color schemeNew bracket to allow for future alternative attachment optionsDual data connection pointsKit Includes:Display UnitRetractable connection cableStandard 6ft connection cableStainless steel blast shieldThick and thin rubber V-block spacersmicroSD card with adapterBayonet sensorPolymer spacer kit with screw hardware and allen wrenchHeavy duty strap with thumb nut tightenerHard case with custom cut foamAlignment rodInstructions