High & low welding gauge both standard and Metric reading Changes from standard to metric simply remove gauge body, turn scales over and replace body; Measure internal misalignment 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, Manufacturer: XIAOQENAN