The Harpenden Adult "Supine" Table is constructed similar to the Harpenden Stadiometer. It has the same ease of movement, the same potential for speedy and error free direct readings, to the nearest millimetre of a subjects length (height), over a range of 300mm to 2100mm. The main frame is made of light alloy. Its sliding member operates via ball-bearing rollers in order to ensure a movement which is free yet without cross-play. All the metal parts of the Harpenden "Supine" Table have a silver/grey hammer finish.