Soba Combined Depth Gauge Protractor
This has permanantly etched graduations from 0-180 degrees in opposite directions . The depth gauge rule is 6″ (150mm) long with a 1/4 (6mm) width. It has graduations to 32nds and 64ths. It is a useful tool for setting bevels and transferring angles. It can be locked with the help of a spring tension nut.