| http://www.w3.org/ns/prov#value | - A calibration cell according to this embodiment, containing a reference liquid 12 having non-gaseous reference constituents, allows the calibration of corresponding sensors for measuring the parameters of non-gaseous constituents such as ions, including sodium, potassium, calcium, and the like, and organic molecules, such as glucose and various enzymes, as well as pH and gaseous fluid constituents
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