Having glass tubes 220x8mm (internal diameter), one closed at the top while the other open. The lower ends of the tubes are drawn out & connected together by 1.5m of rubber pressure tubing (outer dia 10mm & inner dia 5mm). Both the tubes are mounted on brackets which can be locked on any portion on the metal supporting rods. Stand is made of approx. 1.06m in height & carries a graduated scale 0 to 100cm with mm divisions in centre & figured every 2cm up either side on heavy metal box.