Wis. Stat. § 858.15

Assets, the value of which is readily ascertainable without the exercise of judgment on the part of an appraiser, shall not be appraised. The value of these assets shall be shown in the inventory and verified by the personal representative, and the personal representative shall provide evidence of value as the court requires. Where evidence satisfactory to the court is produced to establish the value of any inventoried assets, no appraisal shall be required of the assets, unless a formal appraisal is requested by persons interested, the department of revenue, or by the court on its own motion.