Ultrasonic Testing (UT) can be used for the detection of surface and sub-surface irregularities/flaws
An ultrasonic thickness gauge is a measuring instrument for the non-destructive investigation of a material's thickness using ultrasonic waves.
Magnetic Particle Inspection (MPI) can be used for the detection of surface and near-surface flaws.
Dye Penetrant Inspection (DPI) can be used for the detection of surface breaking flaws in non-porous materials.
Hardness Testing (HT) can be used to measure the hardness of a material to aid in material selection/acceptance
Visual Testing (VT) is an NDT method used extensively to evaluate the condition or the quality of an item.
Coating Thickness Mesaurement
High Temperature Thickness Gauging