China ROKTOOLS V-WAC welding gauge Part No: WG-501 Manufactured by Rok International Industry Co., Limited. Gage quickly determine if fillet welds meet NRC Visual Weld Acceptance Criteria for structural weldments. It easily and quickly checks the four essential measurements required for compliance with NRC Visual Weld Acceptance Criteria. It checks undercut depth, porosity comparison, amount of porosity per linear inch and crown height. The undercut depth or crown height scale can be read to 1/32 inch. Porosity comparision of 1/8" and 1/16 inch. Linear gage in 1/16 inch increments. The gage is easy to set and a locking screw holds it in position for later reference. All four required measurements are made with a single gage. Manufactured by Rok International Industry Co., Limited. Checks undercut Crown Height Porosity&Pits Metric or English Quality stainless steel construction