its about a foot long,with 3 plungers at the base operating the dti.pretty old,the box its in has dovetailed joints!i'm guessin its for measuring the bore of something but dont know why there are 3 plungers!
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Looks expensive (as most "instruments" are), no idea what it is!

could be an old alien bum probe

Looks like a 'Dial Bore Gauge'.

Used for checking for tapers or ovals in bores.

you got a picture of the dial face?

That may give someone a better chance of guessing!!

As ^^^^

Nice instrument in the right hands...
(what the wife says all the time!!!)

bore mic....

nice find

i'll take another picture when i'm home.its just a normal dti face i think.one large dial,one small one counting full revolutions.

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Originally posted by r1_pete
Looks like a 'Dial Bore Gauge'.

Used for checking for tapers or ovals in bores.

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cheers fellas.guessed it was something like that.it was in a box of other regularly needed things such as a kingpin reamer for a 1937 austin 10!father should really tidy his garage more often!

Its called Brian

quote:

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Originally posted by Mr Whippy
could be an old alien bum probe

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quote:

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Originally posted by Daddylonglegs

quote:

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Originally posted by Mr Whippy
could be an old alien bum probe

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What does a 'new' alien bum probe look like then? Hope you don't mean old as in 'used'

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Agree....that is definitely a dial bore gauge.

Typically you will set it up (ie zero it) with ring gauge of known size and accuracy then use it to gauge bores giving you a plus or minus reading compared to the gauge size.

Yep, bore dial gauge.