Black markings on yellow, with red stud center markings every 16 inches.
Measurements are marked on both sides and both edges, graduated to 1/16th inch.
Engraved graduations on both sides.
Constructed of tough nylon, reinforced with glass fibers for added durability, and resistance to weather, abrasion, and most chemicals.
Positive locking joints and stainless steel spring hinges for added strength.