Possible uses include monitoring kegerator temperatures, beer fridge temperatures and fermentation chamber/area temperatures. Since it displays two temps you could monitor both your kegerator AND fermentation chamber.
Note that this thermometer does not use batteries and needs to be wired to an appropriate power supply. Something that provides DC 4-28V. The probes are waterproof, but I’m seeing where they are food safe. It appears this displays in deg C only.
Also Consider: Taylor 9940
Update: Since this post was published the price, availability or promotion has changed. Check the product page for up to the minute description, price and availability. Also: Today’s Deals on Amazon