Wis. Admin. Code ATCP § ATCP 92.52
The operator of a vehicle tank meter shall at least annually have the meter tested for accuracy by a person who is licensed under s. ATCP 92.20(1) to perform the testing. The person performing the test shall provide the meter operator with a written report of test results. The meter operator shall provide a copy of the test report to the department within 30 days after the testing is completed, and shall retain the test report for at least 3 years.
Wis. Admin. Code Department of Agriculture, Trade and Consumer Protection ATCP 92.52
A tester may, on behalf of a meter operator, provide a copy of a test report to the department as required under s. ATCP 92.52. However, the meter operator is ultimately responsible for ensuring that the department receives a copy of the test report.