The Sonagage IV is a testing device suitable for regular evaluation of different materials. It comprises of 8 velocities of similar materials and 2 velocities that can be modified by the operator using a basic software system. This device can measure 0.20 up to 508 mm. Its measurement depends on the type of material, temperature, and transducer selection. The Sonagage IV is suitable for corrosion and pitting, tube and pipe, and pressure vessels.