potometer
noun
po·tom·e·ter
pō-ˈtä-mə-tər 
: an apparatus for measuring the rate of transpiration in a plant by determining the amount of water absorbed
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“Potometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/potometer. Accessed 23 Dec. 2024.
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