Sounds close to a rotomatic.  The rotomatic come with 3 extensions, 
6, 12, and 18-inch.  Also, one can order the extensions separately.

earlier, Lenny  McHugh, wrote:

>Hi All,
>I use two tools for measuring. A talking tape measure and a device 
>that was made about 60 years ago at the Over Brook School for the 
>Blind in Philadelphia.
>This device is a piece of all thread rod with 16 turns per inch. One 
>side is planed off every 1/2" and the opposite side is totally 
>planed. There is a part about 1"x2" drilled and tapped. and a 
>locking nut. there are two extension rods a 1 and a a 2 foot.
>By counting the turns and feeling from each 1/2" spot I can make a 
>very accurate measurement. Each full turn is 1/16" a half and 
>quarter turn are a 32nd and 64th respectively.
>My talking tape measure is 1/16" accuracy witha metric option.
>It is designed for taking both inside and outside measurements.
>I purchased the talking tape measure from:
>Products for the Blind - Visually Impaired - Suppliers of audible 
>products - Cobolt UK
><http://www.cobolt.co.uk/>http://www.cobolt.co.uk/
>
>Lenny 
><http://www.geocities.com/lenny_mchugh/>http://www.geocities.com/lenny_mchugh/
>
>[Non-text portions of this message have been removed]
>
>
>
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>Checked by AVG Free Edition.
>Version: 7.5.432 / Virus Database: 268.16.6/617 - Release Date: 
>1/5/2007 11:11 AM

John


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