Autocalibration in Metal Mode â Metal scan can be started at any location; Informative LCD Display â Indicates mode, detection strength and more; Distinguishes between ferrous (magnetic) and non-ferrous (non-magnetic) metals; Illuminated Ring around marking hole changes from green to red to indicate detection; Audible Detection Signal â Easily switches on and off; On-Tool Marking Pencil Storage â Accepts standard pencil width; Ergonomic Soft-Grip Area â For sure grip and comfort