The Column consists of a column with a height of 68 cm (26.8 in), a diameter of 11.5 cm (4.5 in), and a capacity of 3.8 l (1 gal US). It has two pressure taps: one at the bottom and one at the top of the column, with quick-connect ball check sockets. The Column is fitted with an integrated bubbler tube, a level measurement ruler graduated in both centimeters and inches, and a removable cap allowing the insertion of level measuring instruments into the column.