NanoVNA case insert for ammunition box

This is a case for a NanoVNA-H which is designed to fit inside a military ammo box. It holds the unit, three calibration standards, and the extension cables. The lid slides into a groove in the top of the box.

The spot for the NanoVNA is outsized to accommodate the protective case
you can find at https://www.thingiverse.com/thing:3818616