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