Professional height rod is ready to mount to a wall for convenient and accurate measuring. Use with any Health O Meter Professional Scale. Laminated scale on rod measures heights from 24" to 83" in 1/16" and 1mm increments. Lock the measuring arm with natural of the tension of the height rod. The measuring arm will not move unless you adjust it. Lightweight rod is made of plastic and includes a hardware kit so you can mount it easily to a wall.