bmw engineering tester can do exactly same as gt1 and more. it works on all bmw cars, including mini and rolls and royce vehicles as well, which use bmw system. this system is only used by bmw engineers in each countries headquarters. it is not used in dealers because it is more powerful than gt1, and it is a little more difficult to use, because it does not have help menu, etc. it can do more functions to all ecu’s then gt1. if you don’t understand the system you can do more damage. that’s why it is used only in engineering. you can still do you basis function, read, clear fault codes, live data and actuators tests as well. accessories: (1)20-pin cable (2)16-pin obd cable (adaptor chips inside the cables) (3)hard disk (software of latest version)