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 10 mm per meter increments. 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.