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Colcod is a program to graphically display the color coding if you enter a value for resistors with 4 or 5 color bands. For resistors with 4 color bands (the most common kind), entering a value will display the nearest standard value in the E12 series and the corresponding color code. Inversely, clicking on the colors of an unknown resistor or capacitor will display value and tolerance and, for capacitors, maximum working voltage.

Color code software decoding resistor