durability error greater than e. errors, occurring after a period of instrument use, are not considered to be significant durability errors, even when they exceed e, if they are clearly the result of the failure of a device/component, or of a disturbance and for which the indication: - cannot be interpreted, memorized, or transmitted as a measurement result; - implies the impossibility to perform any measurement; or - is so obviously wrong that it is bound to be noticed by all those interested in the result of measurement.