HI-LO Welding Gage Measures Internal Alignment of pipe after fit-up/ alignment, cuts radiographic rejects. Measures internal misalignment of pipe before and after tacking. Measurements read in standard one 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; Measure fit- up gap Measure bevel on end preparation; Measure the crown height of welds; Measure fillet weld size; Measure scribed line, socket welds; Can be calibrated to NBS standard.