Their are many versions of micrometers available. Some have dials that are easy to read, and some have digital readout that make it simple for anyone to read. Now there is nothing wrong with this type micrometer. But the accuracy of any measuring device relies heavily on the user, and standard micrometers and vernier scales can be confusing to someone who uses them infrequently. There are a few basics you should know about micrometers to insure the accuracy of your measurements.
Cleanliness is one of the first prerequisites for accurate measurements.
Before you begin your measurement, clean the mikes and the object you are going to measure. This should be done before each measurement. Most good mikes have a spring loaded ratchet or clicker on the end of the barrel that limits the amount of torque applied when measuring. Practice using the torque limiter on empty mikes. Don't be in a hurry.