Measure depths in tight spots and up to 22” deep with this Super versatile tool. Precision measuring instrument used to determine the depth of any shape that has a step, groove, or slot. Features: range: 0 to 22″ (with included 6 extension Rods 1″, 2″, 3″, 4″, 5″, 6″) resolution: 0.0005″ Super high precision electronic indicator: 3 reading functions: inch, metric, & fractional power saving auto off feature extra large LCD display ABS: absolute & incremental reading resolution: .0005″/.01mm/1/128 inch accuracy: +/- 0.001″ indicator gauge conforms to AGD standard and Federal accuracy specifications indicator can be mounted on center or side of base. Base Length: 4″ includes 10 attachments (6 extension Rods and 4 feeler points) protective case included.Range: 0 to 22″ (with included 6 extension Rods 1″, 2″, 3″, 4″, 5″, 6″) resolution: 0.0005″