The 3753 Series Electronic Depth Gages are versatile, easy-to-use tool for measuring depth, slot width, small section sizes and other applications. Removable hook attachment for measurements from the edge of a work piece to the inside or outside edge of slots, grooves, etc. Measures depth, slot width, and hard-to-reach areas. Simple, logical control buttons for ease-of-use. Easy-to-read LCD with .35" high characters. Single long-life battery, with easy access.