4-Step Ultrasonic Calibration Block Features four precision-machined steps for verifying ultrasonic thickness gauge accuracy across multiple depths. Available in Multiple Materials Choose from aluminum, stainless steel, or 1018 steel to match your test material and ensure acoustic consistency. Precision Ground for Reliable Readings Each step is ground to tight tolerances, providing consistent thickness values for accurate calibration and linearity checks. for and Thickness Testing for ultrasonic flaw detection, beam profiling, and thickness calibration in industrial inspection environments. Complies with Industry Standards Manufactured to meet ASTM and EN specifications, suitable for professional use in labs, workshops, and field testing.