Changing or testing the accuracy of the electricity meter. A justification of the request should be provided on the application form. If the meter is found to be registering incorrectly, customer is entitled to a revision of electricity invoices going back to a maximum of 5 years. The applicant can choose to witness the testing of the meter. A charge of €70 which is refundable if upon testing, the meter is found to be outside a tolerance of limit of ±2.5%.