Why would an electronic outside micrometer not return to zero?

There is certainly nothing wrong with analog micrometers.
 
I have a Mitutoyo digital micrometer but hardly ever use it. My goto are the Mitutoyo Mechanical Digital. Never have to worry about batteries. I also have several of the Mitutoyo Digital Calipers that are solar powered so still no batteries to worry about and a few other mechanical mics of various sizes. Only the Calipers were bought new.
 
I’ve never worried about batteries in a micrometer or calipers. I just change them when the go dead. ;)

Tom
 
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