Hi,
Nice packaging.
However, as you use it, you will realize that the 30 to 60cm 50 Ohm cable used for calibration will be calibrated with SMA terminals.
The same piece of cable should be left in for measurement, so you would benefit from using a SMA-SMA cable and an SMA-SO239 or SMA-PL259 adapter. The 30 ... 60 cm cable is SMA male at both ends. When calibrating, need cable and the female- female interleaver will be the Short, Open, Load calibration terminators. The same adapter you need when measuring.
73, Gyula, HA3HZ
Gyula Molnar