car diagnostic tool

I am seeking recommendations for a diagnostic code checker. Can I use an off-the-shelf tester, or is there a recommended tester for my 2020 G90? For instance, this one from Amazon...

I bought a Obometer correction tool called Digiprog III for my car(Hyundai i30), so I want to corrected my car mileage that sell a good price, but I don’t how to install it, who know, please tell me?