This is a holder for a digital thermometer (https://www.rink-milch.de/digital-thermometer-mit-alarm.html) which can be used in two ways. The first one is to place the thermometer on a flat surface like a table in a tilted orientation that it is easy to read the value on the display and push the buttons to operate it. Hanging it onto a rim is the second option (images will follow).

On the left side there is a coiling option to precisely adapt the position of the temperature sensor by changing the free length of the cable