A step wedge calibration block is a precision reference tool used to calibrate and verify ultrasonic testing (UT) equipment. Typically made from high-strength materials like stainless steel or aluminum, it features a series of stepped surfaces to test sound wave propagation and consistency. These blocks are essential for industries like aerospace, automotive, oil and gas, and construction. They ensure equipment accuracy by providing a standardized reference for UT inspections. Available in various dimensions, step wedge blocks support non-destructive testing (NDT) techniques, enabling efficient quality control across industries.