Just to add to what has been said ... the NanoVNA is a lot of capability in a very small FormFactor. Can put it in my Pocket and use it all afternoon trying to coax Antennas into tune. (i.e., the internal Battery lasts for hours) and it is not as shock-sensitive as its diminutive size suggests. Found it really fast to use after getting used to it, and the GUI is v. helpful when tuning up with another Antenna or Band. The newer Nano has a larger screen, and is a little easier to see. The Software available online makes it even better ... Good Luck!.