What is the smallest scale division on the ruler?

The smallest scale division on a standard ruler is typically 1 millimeter (mm). On a metric ruler, each centimeter (cm) is divided into ten millimeters, making the smallest mark represent 1 mm. In contrast, a standard inch ruler may have divisions down to 1/16 of an inch, which is approximately 1.58 mm. The precise smallest division can vary depending on the type of ruler being used.