That's called a indicating micrometer. It takes away the need for feel, friction, or ratchet thimbles. You set it and use the dial to know when you have firm enough contact to maintain consistency in your readings. It's considered high precision.
When the thimble zero lines up, the indicator should be on zero as well. If it doesn't, it may be that the thimble needs to be removed and reset. I hesitate to give specifics without looking at it in person. Unless you can find a way to re-zero the indicator, but not likely beyond the limit hands. Any model number on it?
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