Which device is commonly used to measure voltage in a circuit with a digital display?
Digital voltmeter
Electrical measuring instruments are named after the quantity each one is built to measure, and the correct choice always matches the instrument's name to the quantity wanted.
The quantity to be read here is voltage (potential difference) on a digital, numerical display.
The instrument that measures voltage is the voltmeter, and in its digital form it is the digital voltmeter, which shows the reading as a number rather than a needle deflection.
It is connected in parallel across the two points whose potential difference is wanted and presents a very high internal resistance so it draws almost no current from the circuit.
A digital ohmmeter measures resistance in ohms and needs the circuit de-energised, so it is not used to read live voltage.
A digital ammeter measures current and is connected in series, while a digital wattmeter measures power; neither of these reads voltage directly.
Hence, the answer is Digital voltmeter.
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