General Tools 678MED - Rigid Steel Ruler with 4R Graduations
General Tools 678MED is a Precision 6 In./150mm Rigid Steel Ruler with 4R Graduation that can make very precise linear measurements with Graduations for Every 8th, 16th, 32nd, and 64th of an inch and every 0.5, 10, 20, 50 and 100mm.