POTOMETER, THODAY'S GBIO8029       Consisting of glass tubing 15mm external diameter with sidearm leading to a thistle funnel and tapered at each end, one end to accept the plant stem, the other to meet capillary tubing mounted against a 250mm graduated rule. Apparatus is mounted by Terry clips on to a strong L-shaped stand with rubber feet. Dimensions 305 x 150 x 175mm length x width x height. Capillary bore 1mm.