The DC current range of a multimeter is a multi range DC voltmeter. The parallel connection of the meter head with a closed circuit voltage divider resistor can expand its voltage range. The DC voltage range of a multimeter is a multi range DC voltmeter. The voltage range of the meter can be expanded by connecting the voltage divider resistor in series. Different voltage dividing resistors have different ranges. The head of a multimeter is a magnetoelectric measuring mechanism, which can only measure AC power by converting AC to DC through a diode.

Multimeters, also known as multiplexers, multimeters, triple meters, and multimeters, are indispensable measuring instruments for departments such as power electronics, and generally measure voltage, current, and resistance for the main purpose. The multimeter is divided into pointer multimeter and digital multimeter according to the display mode. It is a multifunctional and multi range measuring instrument. Generally, a multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance, audio level, etc. Some can also measure AC current, capacitance, inductance, and some parameters of semiconductors.