The "What is it?" thread - Part III

It's a Klein bottle but I guess that is not the answer you are looking for
 
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Is it for measuring your nuts ?

edit - too late. Not that I was confident lol
 
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Err, bugger! Many thanks Mike, would love to post a pic but I made that comment and then went to bed so now I won't be able post anything until this evening. Feel free to carry on unless people can wait until later.
 
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