POTOMETER This apparatus allows the student to measure transpiration with minimal risk of breakages. This is a used for laboratory and field use. This apparatus can also be used tomeasure humidity by connecting a porous pot to the third outlet. This apparatus has only one glass component (the capillary tube) and is mounted on a strong backing plate. It consists of a capillary tube with millimeter scale connected via. 3-way tap to a syringe. The cut shoot is connected to the third outlet.