A capacitor kit is a set of components used to build a working electrical circuit. The components can include capacitors, resistors, connectors and other components. Capacitors are key components in the design of electrical circuits and are often used to reduce voltage spikes or protect circuits from dangerous voltages and currents. The capacitors in the kit may range in sizes, but will typically vary from 1uF to 1000uF. Some kits may also include adjustable capacitors, as well as capacitors with various voltage ratings. Many kits may also include some tools, such as a soldering iron and a multimeter, so that technicians can check the resistance and continuity of the circuit. A capacitor kit is an essential tool for any electronics manufacturer or hobbyist.