### Defining Environmental Parameters

Temperature, pressure, and humidity affect the measurement values acquired by your Leica tracker. Compensation is provided for measurements based on the changes in these values which are used to calculate the refraction index of IFM / ADM.

You can use a Meteo Station to provide these values or you can enter these values manually if you do not have a Meteo Station. When the Meteo station is enabled, the refraction is calculated every 30 seconds. For changes that are greater than 5 ppm, the parameters are will be updated accordingly.

To manually alter these values either:

- Edit the "Leica Environmental Parameters" from the Machine Options dialog box. If you have a Meteo station but would like to manually edit the values, deselect the Use Temperature Station option.

or...

- Edit the Environmental values by clicking the value and typing the new value in the Status Bar. To view the Leica status bar, select the View | Status Bar | Tracker menu item.