stainless steel, & long for time service Measure fit up for Measure bevel on end preparation; Measure height of welds; Measure fillet weld size; Measure scribed line, socket welds Measures internal misalignment of pipe before and after tacking Measurements read in standard side, and metric on the opposite side Changes from standard to metric simply remove gauge body, turn scales over and replace body; Measure internal misalignment High & low welding gauge both standard and Metric reading, Manufacturer: SHANGYAKEJI