Except for electrical meters, Maintenance tolerances shall apply to measuring equipment?

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Maintenance tolerances are the limits used to ensure a measuring instrument remains within acceptable accuracy after it has been altered in some way. They apply when the instrument is being returned to service after repair or overhaul, and also when it is brought back after an official rejection. In both cases, the instrument may have drifted or fallen out of tolerance, so a re-verification ensures it meets the required standards before it can be used again. Because electrical meters are exempt from this requirement, those tolerances do not apply to them. Since the two relevant scenarios involve re-entering service after repair/overhaul or after rejection, the option that includes both is the best fit.