I’m assuming it’s a torque wrench, which can apply variable force to a bolt.
Scan a barcode next to the hole, insert bolt, wrench applies correct force for the piece.
They can also similarly check the tightness of the bolt and record what it measured for quality control.
Every bolt doesn’t use the same torque, and manually inputting the value is slower and more error prone.
Similarly, checking the torque and recording that it was correct and fixing any errors is slower and more error prone with manual lookup.