Determination of transpiration in plant leaves is aim of laboratory Potometer.
It has a graduated, narrow bore, horizontal glass measuring tube with a vessel for a plant shoot at one end along with a vertical limb and stopcock and a funnel fitted by a ground glass joint.
It is mounted on a wooden stand and is used for demonstration, of transpiration rates and rates of water absorption by a cut shoot under various external conditions.

A plant shoot is sealed into a stopper which fits the end tube, and the whole apparatus is filled with water, the open end of the capillary tube, which is graduated in millimetres, dipping into a beaker of water
Height to top of reservoir: 170mm
Diameter of reservoir: 20mm
Overall Length : 320mm
Base: 320 × 80 mm (Length × Width)
Capillary bore : 1mm

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Potometer