SnapMeasure

SnapMeasure Publisher's Description:
SnapMeasure is a plugin tool for Adobe Illustrator which addresses several weaknesses of the built-in measuring tool and will tremendously improve your productivity:

# It clearly snaps with visual feedback to elements on the page (no more measuring three and four times to be sure you are getting the right value!)
# It can put the measurement values right where your eyes are -- next to the cursor. No more having to look up at the Info palette.
# It lets you scroll or zoom during a measure (no need to make sure the start and end points are both on the screen before you start measuring).
# It lets you change the color of the measure line, for better visibility on certain backgrounds.
# It can optionally set and reset the constrain angle and cursor key distance without having to open the preferences window.

What's new in this version:

# New feature: Precision (number of digits displayed) is now user-selectable
# New feature: Ability to measure the radii of curvature and tangent angles of Bezier curves
# New feature: Ability to display multiple Bezier curve normals and convert to path segments
# Bug fix: Grid immediately redrawn when constrain angle is reset on Option tool-icon click