The Excalibur Crossbow Scope is designed with today"s avid crossbow hunter in mind. This Vari-Zone Scope allows you to precisely compensate for the trajectory of any crossbow shooting between 250 and 350 feet-per-second for up to 50 yards in exactly 10-yard increments. With this Excalibur Crossbow Scope, you can change arrows without having to relearn the trajectory scale or else to perfectly tune your scope to any crossbow. This shooting scope is virtually parallax free at normal crossbow shooting ranges. The Vari-Zone Scope offers sensible adjustment clicks of 1/2 at 20 yards. This easy-to-use, efficient Excalibur Crossbow Scope measures 13" long x 3" wide x 3" high. Excalibur Vari-Zone 2-4x32mm Crossbow Scope: * Allows you to sight in for 30, 40 and 50 yards * Gives you the opportunity to change arrows without having to relearn the trajectory scale or else to perfectly tune your scope to any crossbow * Virtually parallax free at normal crossbow shooting ranges * Sensible adjustment clicks of 1/2 at 20 yards * Model# 1982