A ruler is marked with lengths, such as inches or centimeters.
a straight edge has no measurements, it's simple a perfectly straight device used for things like standardized tests in geometry (for example, you have to find the length of something and you do so by using a length that they give you on the test and your straight edge, so that you can't just measure it outright).
The other advantages of gel roller ball pen are:
* Less pressure needs to be applied to the pen to have it write cleanly. This permits holding the pen with less stress on the hand, saving energy and improving comfort.
* The inks usually have a greater range of colors due to the wider choice of suitable water-soluble dyes and/or to the use of pigments.
* They usually tend to write more boldly and clearly than ballpoint pens do
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