The ACE Screw Counter (ACE101/BL) is a process control system that monitors the fastening assembly process. This unit tracks the fastening of each screw in an assembly process, then notifies the result. The unit keeps a summary of the good and complete assemblies as well as the bad and incomplete ones throughout the day’s production. The ACE is easily programmed via the interface screen and the keypad. The unit provides the operator audible and visual indications that the assembly has been completed without error and it is safe to move on to the next process step or if it has been rejected.