* Rulers are typically marked in inches and fractions of inches.
* A millimeter is much smaller than an inch. There are 25.4 millimeters in one inch!
To get a sense of size:
* If you have a standard ruler, the smallest markings you'll likely see are 1/16th of an inch.
* A millimeter is about the thickness of a dime.
If you need to measure in millimeters, you'll need a metric ruler or a measuring tool that includes millimeter markings.
