V-Wac Biting Edge Stainless Steel Welding Gauge Gage for Welder Inspection Widely used to check undercut depth, porosity comparison, amount of porosity per linear inch and crown height Accurate figures and increments are etched into surface 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