Distributor will, at its own expense, make periodical tests and inspections of its meters in order to maintain a high standard of accuracy. Distributor will make additional tests or inspections of its meters at the request of Customer. If tests made at Customer’s request show that the meter is accurate within 2%, slow or fast, no adjustment will be made in Customer’s bill, and Distributor’s standard testing charge will be paid by the customer. In case the test shows meter to be in excess of 2% fast or slow, an adjustment shall be made in Customer’s bill over a period of not over 30 days prior to the date of such test, and cost of making test shall be borne by Distributor.