This is my Nano very tiny handheld VNA-H. It’s an antenna analyser, amongst many other things. Unlike the Nano VNA-H4 which has a 4 inch screen, this little beauty has a 2.8 inch screen. Don’t let the size fool you. This is an amazingly powerful little tool.
The video below shows how to use the analyser to check SWR on a 2 metre 145MHz antenna.