How do I test the USH-9 indoors?

To test the USH-9 and to verify its distance/level measurements turn the device upside down so that it is facing the ceiling of a room. Now, click the buttonLevel/distance test in the Level and distance menu. The USH-9 then triggers a measurement and returns the current distance and level.

Place a sturdy, flat object (e.g. book) underneath the USH-9 and perform additional measurements to check a second distance/level.

ATTENTION  If the USH-9 is configured for snow applications do not use the general measurement function (Measurement (F3)-tab) of the Commander! The snow application mode has a measurement filter (Rate of change filter, RoC) that suppresses abrupt level changes. Thus, it may take some time for the USH-9 to read the actual distance.