Fowler High Precision 4" to 20"/100 to 500mm capacity Inch/Metric/Fraction Conversion 4" preset Zero set Hold function Preset measuring depth at 1" or 1.5" Resolution: 0.0005"/0.01mm (fractions in 1/64" increments) Protected to IP54 specifications Beam has vernier scale to double check reading Thumblock Includes wooden case