ULTRASONIC PROBES:

DG - 210 : Standard Probe : For plane and externally curved surface like pipes, cylinders of
    outer diameter more than 50mm.
DG - 220 : High Range Probe : For thickness more than 100 mm
DC - 210 : Low Curvature Probe : For smaller diameter curved surface like pipes with outer
    diameter between 25 to 50mm.
DF - 206 : Finger Tip Probe : For closely spaced or congested areas.