4-Step Thickness 1018 Steel Ultrasonic Calibration Block with 20*20mm Step Size for UT Testing

4‑Step Thickness 5‑10‑15‑20 mm Ultrasonic Testing Calibration Reference Block 1018 Steel Precision 4-step calibration block manufactured from 1018 steel, designed for accurate calibration of ultrasonic thickness gauges. Features four distinct thickness steps for comprehensive testing and verification. Product Features 4-step calibration block for ultrasonic thickness gauges Four distinct thickness steps: 5 mm, 10 mm, 15 mm, 20 mm Manufactured from precision 1018 steel