No need for the book! Now we have a lovely handmade 'Marker' to place on your head to get a perfect reading on your Ruler Height Chart. We take a Ruler then hand cut the Marker, stain and buff it and pop a hole in so you can hang it alongside your Ruler, ready for the next round of measuring. Place it on the person’s to be measured head, push it up against the height chart, and the flat surface makes sure each measurement is mm perfect.