Measures Depth and Location of Rebar Up To 6” Through Concrete. Differentiates Between Steel (Ferrous) and Copper or Aluminum (Non-Ferrous) Metals. Detects wood up to 6 inches deep. 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. One button calibration for all surfaces. Includes the M12 REDLITHIUM battery. Great gift for the professional or DIY handyman.