The Hi-Lo Welding Gauge is a multipurpose tool used to measure various parameters in pipe welding applications. It can be used to measure internal misalignment after fit-up, pipe wall thickness, bevel angle, fit-up gap, fillet weld leg length, and butt weld reinforcement. The gauge provides both inch and metric units of measurement on the same tool, allowing for convenient dimensional verification. The Hi-Lo Welding Gauge is designed to satisfy industry fit-up codes and help reduce radiographic rejects by accurately measuring internal misalignment. It features a locking screw and alignment stops to facilitate precise measurements.