The G.A.L. Gage Co. Cat # 5 V-WAC Single Weld Gauge GAL-5 is available in fractional, decimal and metric increments. This tool allows you to perform several different types of measurements and to compare weld defects. With this tool, you can measure: Undercuts or Pits, Reinforcement of Butt Welds, Outside Misalignment, Surface porosity per linear inch and Compare surface porosity for size.