What is this tool thread?

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I have shown these pictures to so many people and everyone suspects it's a micrometer of some kind but there's so much more tool than the small measuring piece. Also thought it looked a little like a ring land cleaner but it's not one of those either. Picked it up in a pile of engine tools. Haven't the slightest idea. Maybe a thread measurement tool? please help haha

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It's a micrometer for sure but for measuring a deep offset. A specialty instrument for sure.
 
Ceiling tile cutter and ceiling wire twister, you got to have both....well if you want the job to go quicker.
 
Ceiling tile cutter and ceiling wire twister, you got to have both....well if you want the job to go quicker.

I prefer to cut the edges by hand without that tool to be honest. But I’m surprised someone guess those two. Well done.
 
I have a lot of buds I help out in a pinch...., I'll help you, you help me deal, you learn a lot.
 
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