doUnit on a FieldMeasurement pairs with dissolvedOxygen to make the reading interpretable. Dissolved oxygen can be expressed as mg/L (mass concentration) or percent saturation, and different monitoring programs may require one or the other. Storing doUnit separately ensures the dissolvedOxygen value is unambiguous when compared across events, wells, or different field instruments — particularly important when evaluating purge stabilization criteria.
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Dissolved Oxygen Unit
`doUnit` on a FieldMeasurement specifies the unit in which `dissolvedOxygen` was measured (e.g., mg/L or % saturation).