What is a radiometer used for?

I thought that was a Geiger counter

Sam, that’s what I thought also.

MurrieL, me too - i think this answer was taken directly from Wikipedia and although the description of radiometer is correct - the intensity of radiation is picked up by a geiger counter I believe whereas I assume this is describing picking up radiation of any source? The answer confused my overall thought process on this question?!🤦🏽‍♂️🤯