What is multimeter and its function?

A digital multimeter is an indispensable tool for testing, diagnosing, and troubleshooting electrical circuits, components, and devices. It’s used primarily to measure voltage (volts), current (amps), and resistance (ohms).
A multimeter can be a hand-held device useful for basic fault finding and field service work, or a bench instrument which can measure to a very high degree of accuracy. They can be used to troubleshoot electrical problems in a wide array of industrial and household devices such as electronic equipment, motor controls, domestic appliances, power supplies, and wiring systems.
UT89XD is good at Measuring DC/AC voltage, DC/AC current, Resistance, Capacitance, Diode & Triode,, and LED test (unique function).
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