Which instrument is used to test circuits for voltage and continuity?

The instrument that is used to test circuits for both voltage and continuity is the voltmeter-ammeter. This device combines the functions of a voltmeter, which measures voltage, and an ohmmeter, which checks for continuity in circuits.

When performing electrical troubleshooting or diagnostics, it is essential to know both the voltage present in a circuit and whether the circuit is complete (i.e., there is continuity). If you were to use only a voltmeter, you would measure the voltage but would not be able to determine continuity. Similarly, an ohmmeter alone would indicate whether there is a path for current but would not provide voltage readings.

In practical applications, having a single instrument that serves dual purposes makes it easier and more efficient for technicians to evaluate the health of electrical circuits. This versatility helps in quickly diagnosing issues, confirming power supply to various components, and ensuring that the circuit is operational.