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.

A multimeter can be used not only to measure the resistance of the object being measured, but also to measure AC and DC voltages. Some multimeters can even measure the main parameters of transistors and the capacitance of capacitors. Fully mastering the use of a multimeter is one of the most basic skills in electronic technology. Common multimeter types include pointer type multimeter and digital multimeter. The pointer type multimeter is a multifunctional measuring instrument with a meter head as the core component, and the measured value is indicated and read by the pointer on the meter head. The measured values of the digital multimeter are directly displayed in digital form on the LCD screen, making it easy to read, and some also have a voice prompt function. A multimeter is an instrument that shares a common meter head and integrates a voltmeter, an ammeter, and an ohmmeter.