Earlier there was a comment in one of the threads asking if anyone had measured the accuracy at high values of resistance. Here are four data points I measured this morning. The measurements were done at 500 kHz in order to minimize the reactance of the test fixture which was a pair of binding posts on a BNC adapter. The first value is the actual resistor value as measured on a VOM and the second is the value indicated by the Smith Chart on NanoVNA.
810 ohms - 810
1500 ohms - 1500
2980 ohms - 2880
8100 ohms - 7940
WA8TOD
Warren Allgyer