Equipment/HP3488A Electronic Switch Unit
Most of above card come both with a screw-terminal and D connector breakout. You generally want to use the D connectors - a large pile of spares are in the drawers on your right.
You can use this unit in many ways. First it is basically is a robust relay/IO system (and as you can verify a relay setting; it won't lose them across powercuts and is autonomous from the PC/laptop controlling - it is generally more suitable for controlling the more dangerous things - such as a climate chamber left on overnight). Secondly - as it understands GPIB one can use the matrix or the relay cards to measure many values in quick succession - with the HP3488A going to the next value on completion of the metering (as it follows the action on the GPIB bus).