1- distinguish from board colour
There are mainly three kinds of VAS 5054A ODIS scanners in China, with three different printed circuited boards- green 5054a PCB, blue and white PCB, displayed as follows:
The green 5054A hardware stands out among the three ones, tested by thousands of users without any issue when diagnosing or modifying.
* Reference: How to tell printed circuited board (PCB)?
2- differ from Bluetooth module
You can see two types of Bluetooth modules in the markets:
AMB2300 chip – it’s Bluetooth v4.0 module usually in VAS 5054A OKI Chipvas 5054a (better in Bluetooth performance)
it’s Bluetooth v2.0 module, usually in 5054 plus
High quality VAS5054A with Bluetooth AMB2300 module
Normal 5054 plus scanner with ordinary Bluetooth module
Note: not all 5054a scanners come with Bluetooth module; but you can add it yourself if equipped with knowledge and technique.
3- tell from OKI chip
OKI Chip is an important component that it can support USD protocol for old cars.
The newly designed 5054a can support UDS and PWM protocols for new and old VW, AUDI, Skoda, Seat cars.
So, combined with all good components, a high-quality VAS 5054A scanner should be designed with an AMB2300 Bluetooth module and OKI chip in a green board, verified to run well with ODIS 3.0.3 software from OBD2TOOL.