Leupold GX-5i Operating Instructions Manual page 19

DAY OF PLAY TEMPERATURE INPUT (dP)
Temperature is one of the factors used to determine TGR ranges;
inputting the current temperature will increase the accuracy of your
TGR measurement. The default temperature setting is 75 degrees F
(25 degrees C).
NOTE: If yards is selected as the desired measurement output,
the temperature will automatically be measured in Fahrenheit. If
meters is selected, the temperature will be measured in Celsius.
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