[G0HZU_JMR]

Yes, I've got one of the early Hugen 2.8" nanovnas with the blue PCB. I made sure I got it from a proven vendor and it works surprisingly well. If it is of any interest I tested a suite of SMD resistors with it across the HF bands a couple of days ago. The resistance range was 0.167 Ω to 330 kΩ.

See below for the results. Obviously the nanovna struggled with the 330 kΩ resistor (the top trace) but it did remarkably well up to about 100 kΩ where the reflection coefficient is 0.999.

The 0.167 Ω resistor was made with three 0.499 Ω resistors in parallel so the resistance creeps up from 0.167 Ω to about 0.200 Ω by 30MHz. I think this is partly due to the metal losses involved in the stacking and soldering of three resistors in parallel.

The 0.499R resistor is a very good quality SMD resistor designed for current sensing and it has a 1% tolerance and the short and very fat package shape minimises metal loss. So it shows a flat response to 30MHz. Flatter than the regular 1 Ω 0805 SMD resistor above it.