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OBD Scan Tool Advice

2012 MS P85. New to the Tesla world.

My brief research indicates there are three parts (in my case 3 because of model year) to utilzing an OBD Scan Tool:

1. Diagnostic Adapter like this one - https://www.amazon.com/dp/B09KQK9SF7
2. Bluetooth Scanner i.e. OBD Link
3. App on phone i.e. ScanMyTesla

Advice: What are pro/cons from this set up? Is it worth the investment or just cool to have at first but now never use it? Which Bluetooth Scanner is a "Best Buy". Which app gives you best value?

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