GIMP/Measure Tool
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The measure tool measures length of the visible line, width, height and angle shown in the status-bar.
In the tool options there is a check-box Use info window, if checked a window will show itself when you begin measuring providing you with the same details as before. Use info window is disabled by default.
[edit] Key Modifiers (defaults)
Shift - starts a new measure from the point the lasts end, without deleting the old one;
Ctrl - puts the tool into straight line tool, also creates a horizontal guide;
Alt - creates a vertical guide;
Ctrl + Alt - allows to move the measure, also creates both horizontal and vertical guide.
