I assume that the reason is to reduce error from having a person read the height from a scale. It would also make the nurse's job easier because they wouldn't need to have to fiddle with the analog scale. I know my kid hates getting his height/weight measured, so anything that speeds up the process is good.
Another potential benefit is that the digitized scale could be directly attached to a wall without regard for it's height relative to the ground. There could be a defined calibration offset stored in the reader, so the contractor wouldn't need to be exact when the bar is installed.
Another potential benefit is that the digitized scale could be directly attached to a wall without regard for it's height relative to the ground. There could be a defined calibration offset stored in the reader, so the contractor wouldn't need to be exact when the bar is installed.