Mahzan, Shahruddin, and Babie Jane Roger. 2023. “The Evaluation For Accuracy of Ultrasonic Non-Destructive Testing In Measuring Thickness on Dissimilar Material By Using A1207 Pen-Gauge”. Research Progress in Mechanical and Manufacturing Engineering 4 (1): 404-12. https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/9324.