Screen Ruler

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Screen Ruler
This program shows a configurable ruler on the screen calibrated in pixels.
It is useful when designing and debugging graphical user interfaces.
The configuration window and an example of the ruler in place are shown below.
The following can be configured: The configuration window also shows the dimensions of all the connected monitors and the insets (spaces for system menu bars etc.). The question mark brings up the instructions.
The ruler itself is always shown in the foreground in front of all other windows. It can be moved with the mouse and removed with the escape key.

Screenshots

Screen Ruler Configuration
Screen Ruler over a Graphic