You can customize your ruler color and transparency.
Enlarge pixel point with Loupe window.
You can use many rulers.(up to 12) And drawing guide lines.
You take a screenshot and set the background image. Also You can Export PNG image from ruler window.
Setting the background image. Available format : JPEG GIF PNG and PSD.
Background image pattern : Single Image / Repeat XY / Fit Window Size
I'm looking forward to your feedback and comments.
For the next version.