Can you put the thermometer back in its tube when you’re done using it?
The kanji and the word are exactly the same. That means they share meanings as well. Additionally, a cylinder is a pipe as well.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you to remember: When it comes to pipes, you always want to have two sets of two of them, just in case. So, that's a two two (つつ) set of pipes, lined up next to each other for backup.