The Joulescope JS220 BNC front panel connects to coax cables for lower noise measurements. Standard RG-58 coax cable is limited to 2 amps max.
The JS220 includes the 2 mm Allen wrench used to swap the front panel. To swap the front panel, remove 2 screws, remove the bumper, unplug the existing front panel, plug in the new front panel, fit the bumper, and replace the screws.