3. Accuracy of the meterPrepayment metersSmart metersChecking your meterStandards of performanceStandard metersPrepayment metersExceptionsMeter examinersElectricityGasResultsEven if the details on the bill appear to be correct, the meter itself may be faulty. Meters must be approved and certified by meter examiners.1Sch 7 EA 1989; s17 GA 1986 If, as is the normal situation, the meter belongs to the supplier (or gas transporter), it is responsible for keeping it in proper working order.2Sch 7 para 10(2) EA 1989; Sch 2B para 3(3) GA 1986 An electricity meter is deemed to be accurate if it does not vary more than +2.5 per cent to -3.5 per cent from the correct reading. For gas meters the limits are +2 to -2 per cent.Note also that if gas or electricity appliances are old and/or have not been serviced recently, they may no longer perform in accordance with their rating. 1 Sch 7 EA 1989; s17 GA 1986 »2 Sch 7 para 10(2) EA 1989; Sch 2B para 3(3) GA 1986 »