The Reference temperature boxes contain the reference temperature from which temperature compensation adjustments need to be applied.
The amount of correction to be applied is based on multiplying the material coefficient by the difference between the current and reference temperatures.
Amount of Correction = Material coefficient x (Current temperature – Reference temperature)
If the current temperature is the same as the reference temperature, the net effect is that no thermal compensation adjustment is applied.
The value in these boxes is almost always 20 degrees C, or the Fahrenheit equivalent.