What measurements can a digital multimeter perform?

A digital multimeter (DMM) measures: DC voltage (from millivolts to hundreds of volts), AC voltage (typically RMS reading), DC current (often through internal shunt resistor), AC current, resistance (using known current source), continuity (beeps for low resistance), and often capacitance, frequency, and diode test. Key specifications include resolution (digits), accuracy (percentage of reading), input impedance (should be high for voltage), and safety ratings (CAT category for voltage transient protection).