Rockford Systems Inc. offers precision-engraved acrylic copolymer guard-opening scales. A guard-opening scale is a valuable tool to use during the design, installation, and inspection of guards to make sure they comply with OSHA, ANSI, and CSA safety standards.
These compact OSHA and ANSI/CSA guard-opening scales fold to one-third their size to fit in a pocket. English units are on one side and metric units are on the other side. The engraved markings will not rub or scratch off.