Sorry, it's hard for me to judge because there are many clones now. If the version you buy works well, you don't have to worry too much. Thanks to the good design of nanovna, the manufacturer can easily make a usable version, but there will be some differences at higher frequencies. The version I sell will include good shielding and guarantee good isolation. Some clones may also be shielded, but they may cause poor isolation due to their incorrect installation. And I will print the NanoVNA-H label and the hardware version number on the PCB I sell, and there will be a QR code next to the screen of the main pcb for accessing nanovna.com.
hugen
