Millimeter is a unit of length that is one thousandth of a meter. It's often used in measurements to make them more understandable to the average person. Millimeters are also commonly used to describe the sizes and dimensions of things. Millimeter is the smallest unit of measurement in the International System of Units (SI). It is also called a subdivision of a centimeter. One millimeter is about the width of a human hair.

A meter is the basic unit of measurement in the metric system. Originally, meters were the length of a pendulum that shook each time it hit a floor or a beam. The original metric system was based on the length of a pendulum and consisted of 1/10 000th of a kilometer (or one tenth of a millimeter). Today, meters are used to measure everything from length to volume to temperature. Meter is a unit of measurement that originated in ancient India. It was primarily used to measure liquids, such as water and rice wine, but it has since been adapted for other uses. In particular, meter is the standard by which length and weight are measured. Today, meter is most commonly used to measure electricity, gas and water. Butmeter has also been adopted by some industries as their preferred standard for measuring quantities such as freight volume, material flow or production output.