Kinefinity HDMI 4K Cable, 50cm

Fifty centimetres of 4K-rated HDMI, which is the length that runs from a camera body to a monitor on a top handle or an arm without a coil of slack hanging where the operator's hand goes. Long HDMI on a moving rig is how connectors get levered out of sockets.

It is the cable Kinefinity supplies for on-rig monitoring off Kine bodies, and it is cheap enough to carry two, which you should: HDMI is the connector most likely to fail on a shoot and the least likely to be diagnosable in the moment.