If you are trying to decide between the launch x431 or the xtool D9s pro you need to watch this video. I compare both of these high-end scan tools.
LAUNCH X431 PRO3 ACE Elite Bidirectional Scan Tool with DBSCar VII Connector
https://amzn.to/3SHpnHU
XTOOL D9S PRO Diagnostic Scan Tool
https://amzn.to/4drvUig