Proper name for rain gauge

The correct name for a wind speed gauge is (IIRC) an anemometer.

But what is the technical name for a precipitation meter?

Pluviometer. Pluvia[Latin for rain] + meter[to measure]

It’s a rainwatermeasurizer.

Those other answers are all wrong- Yep.

That’s it - thanks dude, although I like rainwatermeasurizer.

Makeswettermeter was another suggestion.