User ID: Instrument custom ID, as defined inside Convergence Instruments Instrument Manager. This ID is used to give your instrument a name that makes sense to you or to your project. If the name is well chosen, it becomes possible to easily locate or recognize one specific instrument among all others you own. The User-ID is written to non-volatile memory of the instruments, as well as inside your CIDataSolutions™ Business Account's database, so it is retained even in the event of a reset or battery failure of your instrument.