Space | Switch ruler mode between horizontal, vertical and two-dimensional. |
Z | Select a window to measure. Cancel with 'Esc'. |
Arrow keys | Move the ruler by one pixel. |
Shift + Arrow keys | Move the ruler by one medium step (defaults to 5px). |
Ctrl + Arrow keys | Resize the ruler by one pixel. |
Ctrl + Shift + Arrow keys | Resize the ruler by one medium step (defaults to 5px). |
Alt + Arrow keys | Dock the ruler to screen boundaries. |
Ctrl + C | Copy current length to clipboard. |
H | Toggle hypotenuse display mode (2D only). |
X | Set marker(s) at current cursor position. |
L | Set marker at current length. |
C | Remove the first custom marking line. |
Esc | Exit Screen Ruler, window selection or help. |
See more keyboard actions in context menu. |