# Measure with markers

This guide shows how to place markers on the graph to measure time and value differences between two points.

## Steps

1. Place the **left marker** (green): hold `Ctrl` and click the left mouse button on the sample of interest.
2. Place the **right marker** (red): hold `Ctrl` and click the right mouse button on a second sample.

   The **Markers** panel appears on the right side of the window.

   ![Markers panel](<../_static/user_manual/markers.png>)

3. Read the values in the **Markers** panel:
   - **Time 1 / Time 2**: timestamp of each marker
   - **Time diff**: elapsed time between the two markers
   - **Value**: the register value at each marker position, per register
   - **Value diff**: the difference in value between the two markers, per register

4. To move a marker, hold `Ctrl` and click again at a new position using the same mouse button (left for left marker, right for right marker).

**Result:** The panel shows the time and value differences between the two selected samples.

## Notes

- Markers must be placed on actual logged samples. Clicking between samples snaps to the nearest one.
- To remove markers, go to **View > Remove markers** or close the Markers panel.

## See also

- [Navigate the graph](navigate-the-graph.md)