When the pointers of ammeter and voltmeter do not coincide with the zero mark on their scale even when the circuit is open what is it called?

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Dear If the pointer of the meter (ammeter/voltmeter) does not coincide with zero of the scale, i.e., it reads a little more or less when the circuit is open, this type of error in reading of the scale is called zero error. It is always substracted from the observed reading regards

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