It resembles a vernier caliper.What is it called?https://www.youtube.com/watch?v=Jxa0-f0fchU&feature=youtu.be&t=154
>>1610299well the backjaw is offset so it looks like u can put it on the edge of something and measure across the face of an object. the ends are really long too. some kind of vernier depth gage? maybe its a layout tool used for scribing a line at a prescribed distance from an edge? where did u get it from OP
T marking caliperhttps://www.aliexpress.com/item/T-Type-Marking-Vernier-Caliper-with-fine-adjustment-T-Type-Marking-Vernier-Caliper-Marking-gauge-T/32452339642.html
>>1610299Scribing gauge made by Matsui Seimitsu Co Ltd. aka 井精密工業株式会社. The OP pic is model KM-20.