PSC 134.31(4)(b)(b) After a referee test. When a utility performs a referee test on a customer’s meter under sub. (2), the utility shall keep the tested meter, in “as tested” condition, at a designated location on the utility’s premises for at least 10 business days after the test result report is issued so that the meter is available should further testing or review be needed. If the meter tests as accurate, the utility may choose to keep the tested meter installed at the customer’s premises for the designated time period rather than storing it at the utility’s premises.

PSC 134.31(4)(c)(c) When a complaint or dispute occurs. When a utility receives a complaint under s. PSC 134.17 or is notified about a dispute under s. PSC 134.064 involving meter accuracy, the utility shall keep the meter, in “as tested” condition, at a designated location on the utility’s premises for at least one full billing period plus four weeks after the complaint or dispute and any appeal of that dispute is resolved so that the meter is available should testing be requested. If the meter was tested during the complaint or dispute process, and it tested as accurate, the utility may choose to keep the tested meter installed at the customer’s premises for the designated time period rather than storing it at the utility’s premises.