Serial Numbering and Tracking keypad A full serial numbering system is provided for those who need to track individual machines or assemblies. Additionally, this feature may be used to control the calibration records of test equipment and tooling. An end product can have a hierarchical serial number structure where sub-assemblies and lower-level components can be defined to be part of a serial number tree. Serial number tracking can be used to manage servicing. Serial number structures can be maintained during BoM maintenance. Serial number records can be maintained linking a serial number, part, customer and dispatch together. Serial numbers can be assigned on purchase order receipt, work order kit issue, work order receipt, job issue, and sales dispatch. Serial numbered products and tracking records can be linked to specific addresses and contacts. Specification and service history can be recorded. Product serial numbering on dispatch can be mandatory. Invoices and credit notes will reflect associated serial number records. Tracking records including time can be maintained, making it suitable for rental services and other repetitive activities such as re-calibration. Serial numbered products on temporary loan can be tracked by expected return date. 028