YUSHI SS 4 Step 0.25'' 0.5'' 0.75'' 1'' Test Calibration Block for Thickness and Linearity Calibration for Ultrasonic Thickness Gauge in UT,304 Stainless Steel

I perform UT thickness exams on pressure vessels and boilers on a regular basis, and having a 1 inch step block is extremely helpful for larger vessels. I checked this against a coworker’s calibrated block and measured it physically with a micrometer, and every step is exactly as marked. I also purchased a stainless steel version from the same company, and it’s the same story there too.