The MTU Test Block (also known as Reference Block Type 3) is an essential quality control tool for Magnetic Particle Inspection (MPI). It is designed to verify the performance sensitivity of magnetic particle suspensions (inks) and dry powders.

Unlike standard test pieces with artificial defects, the MTU block features natural cracks produced by stress corrosion. These fine, distinct crack patterns provide a realistic benchmark for evaluating the degradation of magnetic baths and ensuring your inspection system is detecting the finest indications