An egg dicing board comprising of a rectangular framework having a crisscrossed grid welded onto the top of the framework. The metrology recipe is used to carry out SEM-based dimensional metrology for evaluating patterns transferred onto wafers according to CAD data. The touch panel keyboard unit issues commands to the control unit which in turn operates the units in the device to refund the balance of a prepaid to the user. The second functional module is configured to be detachably coupled to either the power supply module or the first functional module to receive power from the power supply module directly or through the first functional module.