Screen Ruler 4.3 is free, but
unsupported and outdated version.
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Help Info – Questions & Answers
Question: When the Ruler runs in MS Windows 7 / Vista – a border is shown around the ruler. Is there any way to remove the border?
Answer: This trouble comes from the windows theme settings. To get rid of that border, follow the steps below:
1) Rightclick somewhere on your desktop to open the context menu and click "Personalize":

2) The personalization window appears. Click "Window Colors":

3) Window Color and Appearance dialog box appears. From the "Item:" combobox – select "Border Padding" and then set the "Size:" property to 0 (zero).

4) Click "OK" to apply changes. Now Screen Ruler should work as expected.