For example, a 1kΩ resistor with 5% tolerance could actually be anywhere between 0.95kΩ and 1.05kΩ. No resistor is made to perfection, and different manufacturing processes will result in better or worse tolerances. The tolerance explains how much more or less the actual resistance of the resistor can be compared to what its nominal value is. The final band indicates the tolerance of the resistor. The third band is a weight value, which multiplies the two significant digits by a power of ten. In the standard four band resistors, the first two bands indicate the two most-significant digits of the resistor's value.
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