Features and Benefits: 4 to 20 /100 to 500mm capacity Inch/Metric/Fraction conversion 4 Drum preset Zero Set Hold function Preset depth at 1 and 1.5 Resolution: .0005 /.01mm (fractions in 1/64 increments) Protected to IP54 specifications. Beam has vernier scale to double check reading. Can be used to check some disc measurements. Other features include thumb lock and RS 232 capability. Includes wooden case.