The Geiger Counter is very small, and can easily fit in a pocket. It is accurate (as I have compared it to others).
The only thing I have to complain aout is that it takes a very long time to turn on and plays a very long animation each time! Rather annoying! Other than that it is fine, but the menu is barren with no other functions except to measure. I would have at least wanted a settings page perhaps.
It comes with an instruction manual that is very detailed. It has a sleek external design and it is extremely durable.
The product delivered did not have the functions described on the amazon web site. It appears to be an older software version with fewer features. I suspect they shipped an old product since the functionality and manual matches that of an older version. For instance, it is not possible to integrate measurements for up to 2 minutes.
The seller did not respond to my emails requesting a software upgrade or other solution to get to the described functionality.