Screen Ruler - Help

Keyboard Actions

SpaceSwitch ruler mode between horizontal, vertical and two-dimensional.
ZSelect a window to measure. Cancel with 'Esc'.
Arrow keysMove the ruler by one pixel.
Shift + Arrow keysMove the ruler by one medium step (defaults to 5px).
Ctrl + Arrow keysResize the ruler by one pixel.
Ctrl + Shift + Arrow keysResize the ruler by one medium step (defaults to 5px).
Alt + Arrow keysDock the ruler to screen boundaries.
Ctrl + CCopy current length to clipboard.
Ctrl + TToggle the ruler theme between light and dark.
Ctrl + "+"/"-"Increase/ decrease ruler opacity.
HToggle hypotenuse display mode (2D only).
XSet marker(s) at current cursor position.
LSet marker at current length.
CRemove the first custom marking line.
EscExit Screen Ruler, window selection or help.
See more keyboard actions in context menu.

Mouse Actions

Click on a position where a marker is setOpen dialog to view/ delete marker.
Double-click on rulerSet marker at the clicked position.
Mouse wheelResize the ruler.
Shift + Mouse wheelFast resizing of the ruler (large steps).

https://screenruler.sourceforge.io