Thursday Morning Riddle

I’m to copy a sketch; find the source of a call;
To have golfing technology tracking your ball;
An amount in a substance, exceedingly small;
And the evidence left, or you’ve no clue at all.

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Asher Says:

    Trace

  2. Bill Says:

    TRACE is correct. Way to go, Asher!

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