This is a dock for a Weber Connect thermometer, which doesn't only hold the dock, but also holds up to 4 temperature probes in a package with a compact footprint. The temperature probes rest on the probe and the holder doesn't touch the main unit. The leftmost hole is a bit more shallow, which is best for the environment temperature probe as it's a bit shorter than the other ones.

The dock also tilts the main unit, so that the display is easier to read.