Standard Metal PD Ruler with Pocket Clip
Made from stainless steel, with 150 milimeter scale etched on one edge and 6 inch scale on the other, this metal PD ruler is extremely durable. It has an eye for wall hanging in the optical lab and its pocket clip features a perpendicular straight edge, which slides along the scale to mark your measurement.
Please also see OS-661
Standard Metal PD Ruler.