The ACUtility program is used to do maintenance on the AquaCheck probe.
Attached to this Forum article you will find two zip files and one application file for download. (Setup A.zip, Setup B.zip & AcUtility.exe)
Download and extract all the contents of both zip-files to a single normal folder on your computer.
Download the AcUtility.exe to the same folder.
Open the program with AcUtility.exe
Also see the AcUtility User Guide.pdf attached to this article.