Welding Gauge With Magnifying Glass Features: Measures size range from 0 to 20mm Made by stainless steel with lasers etched markings A special measuring tool to measure the angle of weldments crevasse and the weld width, height, weld. Widely applied for measuring welding parts such as boilers, pressure vessels,etc. Portable,easy to use. Specification: Material:Stainless Steel Product thickness: 2mm