What does a digital multimeter primarily measure?

A digital multimeter (DMM) is primarily designed to measure electrical properties, which include voltage, current, and resistance. This makes it an essential tool for electricians, engineers, and technicians when diagnosing electrical issues or performing routine maintenance.

When measuring voltage, the digital multimeter can assess both direct current (DC) and alternating current (AC) voltages. Current measurements can similarly cover DC and AC, allowing users to verify the flow of electricity in a circuit. Resistance measurements are crucial for testing components and ensuring they function correctly without short circuits.

Other options, while important in various fields, do not fall under the primary functions of a digital multimeter. For example, temperature, pressure, and humidity measurements typically relate to environmental testing or HVAC systems, requiring specialized instruments. Frequency, capacitance, and inductance measurements, although relevant to electronics, are usually the domain of more specialized equipment rather than a standard multimeter. Similarly, optical signals and magnetic fields are not within the primary scope of a traditional digital multimeter's capabilities, as they require specific sensors or meters designed for those applications.

Thus, the functions of measuring voltage, current, and resistance encapsulate the core purpose of a digital multimeter, solidifying its identity as a versatile and crucial