The QM178 Security Rule provides a quick relative height reference measuring tool as an individual passes by a door with a security rule in place. The chart is easily mountable on door jams and window frames. The adhesive backing is semi-permanent.
To the left is a closeup of the security rule - to the right is an image of the security rule in it's entirety. The security rule is 1 7/8" wide by 37" high and begins measuring at 3' 8" and measures up to 6' and 8" in height. Height can be quickly read down to the one-half inch.
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