Q: What do you do for a living?
A: I'm a metrologist
Q: So, what's the weather like?
Q: You said you are a meteorologist, isn't it? So, is it going to rain?
A: Hey, no, wait... I said I'm a metrologist: I measure things, no weather forecast.
Q: Why do you measure things?
A: Because things need to be measured, from time to time.
Q: What kind of things do you measure?
A: Mm, well, mm... maybe it's going to rain, after all.