# What is a Precision Resistor?

A Precision resistor is a resistor that has a very low tolerance value, so it is very precise (closely near its nominal value).

All resistors come with a tolerance value, which is given as a percentage. The tolerance value tells us how close to the nominal value a resistance can vary. For example, a 500Ω resistor that has a tolerance value of 10%, may have a resistance that is somewhere between 10% above 500Ω (550Ω) or 10% below 500Ω (450Ω). If the same resistor has a tolerance of 1%, its resistance will only vary by 1%. Therefore, a 500Ω resistor can then vary between 495Ω and 505Ω. This is tolerance as an example.

A precision resistor is a resistor that has a tolerance level as low as 0.005%.

This means a precision resistor will only vary 0.005% from its nominal value.

Precision resistors have very low tolerance percentage values, making them ultraprecise to their nominal
values. They will vary very little from their nominal values, so they are used in applications where high-precision is necessary in terms of
resistance values.

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