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Resistor Colour Code

Read the bands from the end with the tighter grouping. The last band is tolerance; the one before it is the multiplier; the rest are digits.

Band 1 (digit)

Band 2 (digit)

Band 3 (digit or —)

Multiplier

Tolerance

Resistance

—

Tolerance

—

Range

—

Set band 3 to “—” for a standard 4-band resistor.

A helper, not a substitute for engineering judgment. Verify against the governing standard.