The rock climbing equipment company, Metolius, produces this “range finder cam.” The cam anchors safety ropes into cracks in the rock. Notice the green, yellow, and red dots that run along the edge of the cam. The green dots indicate that the width of the crack is safe for use with this device. Yellow indicates that is cam may be place in the crack for adequate safety but the next larger size cam would be in the green and safer. The red indicates that the cam is placed in a crack that is too wide and the anchoring of the cam is not safe.
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