THERMOMETER.

And its not just any old thermometer, this is what we in the business call "one of the glass tubes, with the floating balls of colour that tell the temperature-ometer"
Or in layman's terms, a Galileo thermometer.
I wanted to blip one of these earler, but the one at our house broke along time ago, luckily nanny had one!
After an evening of come dine with me, university challenge, alexander armstrongs big ask, and some sort of combination of bleak old house of stuff, we found this treasue upstairs while others were playing with toby jugs.