The obsolete word repeatability has been replaced by the word repeatability and is an important feature in measurement technology for assessing the quality of a measurement or measurement process and the accuracy of a pyrometer, infrared temperature sensor and infrared thermometer.
Accuracy is determined by precision and correctness.

The precision can be determined by repeating the measurement many times using a previously defined measurement method under the same conditions, with the same measuring devices or measuring systems.
This describes the extent of the mutual approximation between the results of successive measurements in short periods of time.

One measure of repeatability is the standard deviation.
The repeatability thus defines how high the maximum deviation of independent measurement results will be by applying a predetermined measurement method under the same measurement conditions.

The repeatability of pyrometers, infrared temperature sensors and infrared thermometers is usually 0.1°C.