Wis. Stat. § 70.80
The person or persons making such reassessment and the persons serving upon the board for review thereof shall receive such compensation for their services and expenses as may be designated by the department of revenue in the order directing such reassessment. Any witness directed to be summoned by such board shall be entitled to fees for travel and attendance at the rates allowed by law to witnesses in the circuit court, but shall not be entitled to such fees prior to attendance and the giving of testimony. Supervisors of equalization may be appointed to make reassessments, but in no case shall a supervisor of equalization be appointed to reassess a district when the complaint was made or the proceedings instituted by that supervisor of equalization.
Wis. Stat. § 70.80