Full-length, recessed magnetic strip for hands-free use on ferrous metals. Black annodized extruded aluminum frame. Shock-protecting plastic end-caps, 360 degrees reading, acrylic reading barrel vials fit into precision-stamped cutouts held in place by Quick-Change ABS plastic vial covers. Screwed in clear acrylic lenses for easy access and replacement. "Level" vial features large top read window.