Common items that can be used to show tumor size in mm include: a sharp pencil point (1 mm), a new crayon point (2 mm), a pencil-top eraser (5 mm), a pea (10 mm), a peanut (20 mm), and a lime (50 mm).

One millimeter equals approximately 0.039 inches. What are some real-life objects having a 1 mm dimension? Some examples of objects having about 1 millimeter length areA sharp pencil point and the tip of a sewing needle are approximately 1 mm in length.

A millimeter is a unit of length measurement in the Standard International (SI) or "metric" system. A millimeter is the smallest unit of measurement of length on a standard ruler in the metric system. It is abbreviated mm. There are 10 mm in 1 centimeter.

A millimeter (also spelled “millimetre”) is a unit of length in the metric system—a system of units that includes centimeters, meters, and kilometers. 1 millimeter is equal to 1/1000 of a meter, or roughly the size of a pencil's tip. So how do you measure this tiny distance?