Citroen Diagnostic Tools
99% of the Lexia 3 adapters in existence are not the genuine item, but are Chinese manufactured clones, of varying quality.
Other Diagnostic Tools
Most generic code readers can read some information from later model Citroens, but only a Lexia (or clone) can read all the ECUs and parameters.
It would be helpful to add a list of third-party tools here, and their capabilities.