Iskandar, Nurhusnina, and Ir. Dr. Eliza M Yusuf. 2022. “The Evaluation for Accuracy of Non-Destructive Testing (NDT) in Ultrasonic Inspection on Stainless Steel Material by Ultrasonic Testing Thickness Measurement”. Research Progress in Mechanical and Manufacturing Engineering 2 (2): 685-92. https://penerbit.uthm.edu.my/periodicals/index.php/rpmme/article/view/4388.