Wilkins Resistor 5685A

The design for this type of resistor originated with F. J. Wilkins of the National Physical Laboratory.

Often simply known as the "Wilkins" resistor, the design features low temperature coefficient and time constant, making them suitable for AC applications, as well as DC.

The long term stability is excellent and usually far better than the manufacturer's specification of 2 ppm/year.

This particular one is a 100 ohm resistor; this value is frequently used as a reference standard in precision thermometry applications.