Knowledge: Hygrometer is a tool to correctly measure humidity level while an alcoholmeter to know the percentage of alcohol in one's body.

Conversation:
I don't do alcohol because of my religious beliefs, Sobriety.
Sounds neat, so you would not have any measurable alcohol levels or effects from it?
Yes, correct! But do you know the tool that measures alcohol levels?

Response: Oh sure! To know the alcohol percentage in one's body is an alcoholmeter.