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Voltage, current and resistance can easily be measured by using a multimeter. However, an ammeter measures current, a voltmeter measures the potential difference (voltage) between two points, and an ohmmeter measures resistance. However, a multimeter measures all these. There are two types, analogue and digital. The multimeter is the most important electronic test instrument. Two wires are normally used along with the multimeter (called probes) and they are colour coded - black and red.

A DIGITAL Multimeter is highly accurate and easier to read than an analogue type. It is best used for finding the precise value of a voltage, current or resistance.
An ANALOGUE Multimeter is less expensive and less precise than a digital type. Often it will be used for measuring a slowly changing voltage, current or resistance.