Decrease vibration on any Pulley/Sheave System - minimize belt and motor bearing wear, Compact size - easy to use on small diameter sheaves, Faster set ups, Decrease bearing wear, Green beam is 400% more visible than red beam laser, Use as a laser level - check the height and flatness of motor and gear box mounting plates, Aligns belts, pulleys, sheaves, sprockets, gear trains, rollers, platforms, conveyors, and other plant equipment Includes > Red or green magnetic sheave alignment, three precision machined magnetic targets, 2 "AAA" alkaline batteries, instruction manual, hard-shell carrying case