The Empire 12 in. magnetic tool box level is equipped with True Blue vials, which are accurate to within 0.0005 in. per inch in all 10 plumb and level working positions. The VARI-PITCH vial reads slope in 1/8 in. increments per ft. A powerful, full length, magnetic edge frees hands when working with metal materials. A heavy duty extruded aluminum frame with top read windows gives added durability against drops. A top v-groove working edge makes this ideal for users working around pipes or conduit.