Grids & Rulers is a developer tools chrome extension. it's a free extension , it has 3,000+ active users since released its first version, it earns an average rating of 5.00 from 2 rated user, last update is 1443 days ago.
Grids & Ruler is an extension that add a new panel to Chrome developer tools. That panel let you create and manage overlays on pages that provide you visual hints to develop you web app layouts.
You could download the latest version crx file or older version files and install it.
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You could find more help information from grids & rulers support page.
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Exactly what i needed, this should be a builtin. Cheers