Resistor kits are sets of resistors, usually consisting of many different values, packaged together in one convenient kit. They typically contain resistors in standard ranges of resistance, such as decade values, or specific values. Many kits also contain presets, which are easily adjustable resistors that have multiple taps or settings. In addition to their ease of use in prototypes and education, resistor kits can be a very cost effective solution when building a circuit. These kits usually come with a range of different resistor values, allowing you to precisely choose the right resistance for your circuit. Resistor kits can also help save time by eliminating the need to track down specific resistors and measure their resistance.