The multimeter consists of three main parts: a meter head, a measuring circuit, and a change-over switch. The multimeter is the most basic tool in the field of electronic testing, and is also a widely used testing instrument. The multimeter is also known as a multimeter, a multimeter (A, V, Ω, i.e., current, voltage, and resistance), a multimeter, and a multimeter. The multimeter is divided into pointer type multimeter and digital multimeter. There is also an oscilloscope function oscilloscope multimeter, which is a multifunctional, multi range measuring instrument. General multimeter can measure DC current, DC voltage, AC voltage, resistance, audio level, etc. Some can also measure AC current, capacitance, inductance, temperature, and some parameters of semiconductors (diodes, transistors). Digital multimeter has become the mainstream and has replaced analog instruments. Compared with analog instruments, digital instruments have high sensitivity, high accuracy, clear display, strong overload capacity, and are easy to carry, as well as more convenient and simple to use.

A multimeter is a magnetoelectric instrument with a rectifier that can measure various electrical parameters such as AC and DC currents, voltage, and resistance. For each electrical quantity, there are generally several ranges. Also known as multi meter or simply multi meter. A multimeter is composed of a magnetoelectric ammeter (meter head), a measuring circuit, and a selector switch. By transforming the selector switch, it is convenient to measure various electrical parameters. The main basis for circuit calculation is the Ohm's law of closed circuits. There are many types of multimeter, which should be selected according to different requirements when using.