Is there a unit of measurement for proximity?

My apologies for a very simple question! Is there a unit of measurement for the proximity sensor readings?

Thanks in advance!

Which sensor are you asking about? Most of the Python scripts for the various sensors output in mm.

Thanks. I am talking about the results coming out of EnviroPlus HAT. I am using the Piromani Python Library to get the data.

The prox sensor on the EnviroPlus HAT works by sending out a light pulse and measuring the light level reflected back. The result is not in a length unit but simply a light level. If you’re looking to do more precise distance measurement you might want to look at: