What type of test instrument can measure two or more electrical quantities?

A multimeter is an essential instrument in electrical testing and maintenance because it can measure multiple electrical quantities, such as voltage, current, and resistance, all in one device. This versatility makes it invaluable for technicians and electricians, as it allows them to diagnose electrical issues more efficiently without needing multiple separate tools.

The ability to switch between different measurement types means that a multimeter can provide comprehensive information about an electrical circuit, making it easier to pinpoint problems like open circuits, short circuits, or faulty components. Its design often includes both analog and digital formats, providing users with the flexibility to choose what is most comfortable for them. In contrast, other devices like an insulation tester, wattmeter, or voltmeter are designed for specific measurements and do not offer the same multifunctionality, limiting their use in compared scenarios.