what does a potometer do biology
The Potometer. A potometer is a device that measures the rate at which a plant draws up water. Since the plant draws up water as it loses it by transpiration, you are able to measure the rate of transpiration.The basic elements of a potometer are: 1  A plant cutting.2  A calibrated pipette to measure water loss. 3  A length of clear plastic tubing. 4  An air-tight seal between the plant and the water-filled tubing.ince the plant draws up water as it loses it by transpiration, you are able to measure the rate of transpiration. The basic elements of a potometer are: 1  A plant cutting. 2  A calibrated pipette to measure water loss.