FlawTech plate UT-14225, 5 MHz probe on a 45° or 60° wedge (1″ footprint). Step by step: read the plate, find the skip, see how close the wedge can get, place the beam on the root, the middle, the toe and the HAZ, then sweep both sides.
Drag the probe along the plate. Distances are measured from the exit point to the weld centerline.