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    Hey, i have an A level physics practical tomorrow and have been going over past papers, and most of it has been fine but one question on uncertainty has me confused.

    It's asking about the uncertainty of a thermistor at Temperature T.

    The digital ammeter shows a reading of 0.00 before the circuit turned on.

    So i had assumed 0.01/reading * 100 would give the percentage uncertainty as 0.01 would be the smallest division.

    However the mark scheme is telling me the percentage uncertainty is
    0.001/reading * 100

    Is this correct in that the smallest division on a digital scale one SF below the smallest displayed value?
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