I was able to perform simple measurements such as SWR/Transmission/Reflection/Impedance without difficulties. Performing calibrations puts some stresses on the connectors so it's better to sacrifice a replaceable cable than risking port wear-out (although they can be replaced.) - NanoVNA V2 Plus4 works fine for me. The NanoVNA V2 firmware is installed at address 0x8004000 (V2/V2Plus) and 0x8008000 (V2Plus4). Mating cheap connectors with quality ones may result in damage and performance deterioration of the quality equipment - You can protect the NanoVNA port connectors by using short pieces of SMA cables between DUT and NanoVNA. +/- 5 K - One should stick to one cable/connector "ecosystem" if possible. A comparison to a Huber&Suhner 50 Ohm BNC showed a stable resistance over a temperature range of approx. Unfortunately, it was equipped with a NTC resistor so temperature changes (+/- 5K) affected the resistance significantly. Paying 10 bucks for a (2nd hand market) Huber&Suhner 50 Ohm SMA terminator doesn't hurt much and it has some tighter specs like 50 Ohm +/- 1% over a wide frequency range - I measured the resistance of an unbranded 50 Ohm BNC terminator which was within 50 Ohm +/- 2% spec. Joeqsmith has very educational YouTube videos on NanoVNA and calibration standards where he explains the necessities of good standards in order to make comparable and meaningful measurements. I started replacing the included calibration standards with a decent quality ones (Radiall, Huber&Suhner, Spinner, R&S) without going down the VNA metrology rabbit hole.
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