Which type of meter is exempt from maintenance tolerances?

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Drift from wear and mechanical exposure is what maintenance tolerances guard against. Mechanical meters have gears and bearings that wear over time, hydraulic meters have moving pistons and seals that can change with use, and pneumatic meters rely on moving parts and diaphragms that can alter performance. Electrical meters rely on solid‑state electronics and have no wear‑related moving parts, so their accuracy doesn’t drift in the same way. Any change in performance is addressed through calibration against traceable standards rather than applying a maintenance tolerance to a worn component. So, electrical meters are exempt from maintenance tolerances.