Alan,

On Fri, 30 Sep 2005 09:11:46 +0100, Alan B. Pearce wrote:

> >I need to be able to find distances between
> >20-100ft or so with maybe 1ft accuracy.
> 
> I would have thought that an ultrasonic ranger - the sort of thing real
> Estate Agents (Realtors for our American friends) would use to measure room
> sizes, would fit the bill.

Not at that range, I'm afraid - the best ones run out at about 20m (60') or thereabouts.  You'd need a laser 
for 100'.

Cheers,


Howard Winter
St.Albans, England


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