Thanks mudmanc4. I created this account mostly just to ask this question, so the 'history' I was referring to is the results I see when I go to the testmy url using the device I've been testing (without logging in). The history I see there, seems to be mine, but with several tests missing. Those are the ones I'm asking about.
What identification method is used to link my results to my device?
Why are some of my results absent in the history?
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This is a graph of all tests taken from a device associated with your account:
https://testmy.net/compID/15824643919