What is latestMeasure.isValid used for?

[apwelsh]

Please explain, what causes isValid to return true or false?

If isValid == false, does this mean the measurement no longer relevant (too old)?

[mehdyouras]

Hello,

isValid value is never updated after the measurement creation. isValid is computed on creation and is used to determine if it should be used to trigger a new recommendation or not.

example:
if a measurement is taken while the probe is outside the water -> isValid = false