Wafer holding mechanism

A wafer holding mechanism for holding a wafer of the type used in the manufacture of semiconductor devices is herein described. The mechanism has a first plate having a number of offsets that define at least one lip that extends radially inward of the offsets. A second plate is positioned adjacent the first plate and generally between the first plate and the lip such that one or more fingers coupled to the second plate oppose the lip that depends from the first plate. When the second plate is moved to a closed position, the at least one lip and the one or more fingers cooperatively grasp an edge of a wafer therebetween. The wafer holding mechanism is coupled to a drive that rotates the wafer before an imaging mechanism for capturing images of the wafer as it rotates.