Resistor for current measurement

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Sorry if there is already a thread like this (I searched, but not hard.) I was wondering if it possible for us to place a resistor in series with the motor to test current. One rule says (I don't know which one, too late at night to look at the manual) that a "low impedence" current monitoring device is fine, but would a low value resistor (<1 Ohm) count? Thank you very much for your help.