I have two:
ScanTool OBDLink LX
Cheap generic ELM327 type
The cheap one works great for pulling and clearing codes.. but if you want to datalog or see realtime data with any kind of speed at all, you'll need to step up to one of the more expensive models like the ScanTool I listed... It works GREAT and does a MUCH better job of realtime streaming data to something like the TrackAddict app.
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