A large different sort of thermometer TYPE thing, or a Hydrometer as someone has suggested as per photo. It looks to have wax down the bottom, and that begins to melt with temperature. I do not know what application this has - SO IS SOLD iS WHATEVER IT IS (so only bid or buy if you will be happy with what you get. It has written on it G H Zeal London Made in England HE C 1168. It looks quite neat. I put it in some hot water, and the wax ? stuff at the bottom began to melt, but I could not see any measurement thing move, so it either does not work, or its for something else - therefore sold as is, and as not working, but may be a good prop for a play, or a retro look item for something. It goes up from 20 to 100, with an F below the 100, but if that means farinheight ?? then 100 degrees F is not very high. Measures approx. 340mm long. So there you go, good for someone perhaps. Happy to wrap & send if you can not pick up. Thanks. 914 refN4171