Estone V-WAC Biting Edge Single Weld Gage Of Welding Inspection Gauge Inch Undercut depth or crown height scale can be read to 1/32 inch. Porosity comparison of 1/8 inch and 1/16 inch. Linear gauge in 1/16 inch increments Pointer is easy to set and a locking screw holds it in position for later reference Figures and increments are etched into surface.