A fire marshal, in the United States and Canada, is often a member of a fire department but may be part of a building department or a separate department altogether.
An average human red blood cell is approximately 5 microns in diameter. The average diameter of human hair is roughly 0.0035 inches in diameter, which is equivalent to 75 microns. The abbreviation micron was initially used to distinguish the units of a tool used to measure small distances, also called a micrometer.
Frame size starts at one inch and goes up to as large as 24 inches. The size of an outside micrometer tells the largest size it will measure.The range of a 1 inch micrometer is from 0 to 1 inch. A 2 inch micrometer has a range from 1 to 2 inches.That is, a 2 inch micrometer will only measure work between 1 and 2 inches thick. A 6 inch micrometer has a range from 5 to 6 inches. It will only measure work between 5 and 6 inches thick.Inside and depth micrometers also have a 1 inch maximum screw movement.Extension rods are used to measure larger sizes. For example, a depth micrometer fitted with a 2 inch rod will measure depth between 2 and 3 inches.rame size starts at one inch and goes up to as large as 24 inches. The size of an outside micrometer tells the largest size it will measure.The range of a 1 inch micrometer is from 0 to 1 inch. A 2 inch micrometer has a range from 1 to 2 inches.