Most used things

What’s the most used thing in your house? It’s probably your phone, but that’s not very interesting. Let’s restrict it to things that are actually useful. (It hasn’t escaped me that I’m asking these questions on a blog that has no comment facility – consider them rhetorical, if it helps.) How do we define “used” here, to be the most of? If it’s in terms of time used, it’s probably going to be your…