A potometer is an apparatus used to measure the rate of water loss, or transpiration, from a plant. In the Ganong's potometer, the rate of transpiration is determined by measuring the position of an air bubble in a graduated tube over a period of time. The change in position is caused by the plant absorbing water to replace an equal volume of water lost by transpiration. 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. The position of the air bubble may easily be adjusted by opening the glass stopcock to admit water from the reservoir. The apparatus is mounted on a wooden base with the tubes held by clips. * Height to top of reservoir 170mm * Diameter of reservoir 20mm * Length, overall 320mm * Base 80 x 20mm * Capillary bore 1 mm * Eisco type BI0193A https://elecena.pl/product/27244223/eisco-b10193a-ganongs-potometer-320mm-long-with-1mm-capillary-bore-size 2024-11-12 https://elecena.pl/product/27244223/eisco-b10193a-ganongs-potometer-320mm-long-with-1mm-capillary-bore-size 2025-04-07 https://elecena.pl/product/27244223/eisco-b10193a-ganongs-potometer-320mm-long-with-1mm-capillary-bore-size 2025-05-25 https://elecena.pl/product/27244223/eisco-b10193a-ganongs-potometer-320mm-long-with-1mm-capillary-bore-size 2025-08-11 https://elecena.pl/product/27244223/eisco-b10193a-ganongs-potometer-320mm-long-with-1mm-capillary-bore-size 2026-05-07 https://elecena.pl/product/27244223/eisco-b10193a-ganongs-potometer-320mm-long-with-1mm-capillary-bore-size 2026-07-13 https://elecena.pl/product/27244223/eisco-b10193a-ganongs-potometer-320mm-long-with-1mm-capillary-bore-size 2026-09-22