The Mercurial Desk Model Sphygmomanometer, made of Aluminum alloy material, measures a range from 0 to 300mmHg. Manually inflate and release air with a pump. It makes use of a 99.999% pure mercury with a manual dial for the mercury tank. It displays the reading with a plate scale where the mercury tube is made of unbreakable material. Its total measurement is 340 x 100 x 55mm including the deluxe nylon or cotton fabric cuff.