2m Retractable Wall Mounted Height Meter, Portable Height Measurement Device Growth Chart for Adult Children, Roll Ruler Body Measuring Tape for Home School Hospital

Needs two people to fit it to the wall accurately - one to hold the base steady at a reading of zero and the other to mark the position of the top part at a reading of 200 cm. Also, although a sticky pad is included it does need to be screwed to the wall, otherwise it has a tendency to come unstuck when you're trying to use it( things I wish I'd known before I bought it)

This is a tape measure with a piece of plastic attached. Simple design, easy to use ad read. Has to be hung at 2 metres and pulled down to give height, which keeps it out of the way, and a lot easier than pulling something up from the floor.

Unfortunately, this product is unreliable. It was installed precisely according to the instructions, exactly 2m from the ground. However, when my family, friends, and I measured ourselves on it, we all appeared shorter than our actual heights.