The M12 Sub-Scanner Detection Tool is a fully featured industrial tool using the M12 rechargeable battery system. The same M12 battery and charger purchased separately, or included from an earlier M12 tool purchase, can be used to power the M12 Sub-Scanner Detection Tool. Milwaukee 2290 M12 Sub-Scanner Detection Tool features: measures depth and location of rebar up to 6" through concrete; detects location of wood, PEX, PVC, and metal; differentiates between steel (ferrous) and copper or aluminum (non-ferrous) metals; ac voltage detection to identify the location of live wires; scans through gypsum, ceramic tile, marble and concrete; intuitive user interface displays stud centers and edges; high contrast, white on black display and backlight for easy reading; rugged over-molding improves durability and user grip; auto-calibration for all surfaces.