# To manually measure a position

Use Manual measure to measure a position that could not be measured by a scan, or to delete a scanned or manually measured position.

1. Follow the procedure for performing an Auto scan up to step 5, where the selected scan range is shown in plan view.

   To select manual mode, tap and hold on the screen and then select Manual measure.

   The selected mode, Manual, is shown at the top left of the screen.

2. If required, configure the Settings and Tolerances.
3. Select the station to measure. You can:
   - Select a station that has been defined by the Scan interval. To do this, tap and hold on screen and tap Select a station.
   - Tap the location that you want to measure. The instrument automatically turns to that position. Alternatively, manually aim the instrument at the position you want to measure.

   The Station,Underbreak,Overbreak and Delta station values are shown.

4. Tap Next. The cross section view of the selected position is shown.
5. Configure the Manual settings. Tap Accept.
6. Configure the Scan tolerances. Tap Accept.

7. Tap Store.

   Stations with no errors appear as solid green circles, while those with errors appear as solid red circles.

If you experience issues getting a measurement:

- If the instrument struggles to get a measurement due to, for example, reflective or dark surfaces, increase the value in the EDM timeout field in the Settings screen.

- If you can't measure to the tunnel surface with DR, then you can measure to a prism that is offset perpendicular to the design surface, where the target height is applied perpendicular to the tunnel profile. To do this, select the Apply target height perpendicular to profile option from Settings. In the case where the prism is held against the tunnel surface you would enter the prism radius as the target height.

- If, when measuring without a prism, your current position (displayed as a cross) fails to update, then ensure the Apply target height perpendicular to profile option from Settings is not selected.

## To delete a measured position

1. From the cross section view, tap a point to select it. The selected point is indicated with a black circle.
2. Tap Delete.

When you select a point for deletion, the instrument target will be the design position for that point. If you select Store immediately after deleting the point, the instrument remeasures the design position for the deleted point.

To restore deleted points, tap and hold on the screen and then select Restore deleted points.