Interchangeable-rod micrometers measure the outside diameter of an object. They are useful when taking measurements from a distance from the measured object.
Since you can easily switch out these micrometers for different sizes, they’re convenient for many purposes. Like when you need to take multiple measurements with different sizes, or you need to measure objects that are at different distances away from you. They’re easy to use because they don’t require any special tools or adjustments. All you have to do is place them on your object and read the measurement.
The pros of using interchangeable-rod micrometers include their ease of use and high accuracy levels. Their main con is that they’re more expensive than some other types of measuring equipment available today.
Interchangeable-rod micrometers are best for industrial applications where accuracy matters most and where you take multiple measurements over time (such as during production line runs).