Marco., thats a great URL; thanks.

>
> OK, but there is nothing to stop you shining your light through the tube
> (assuming it is a clear tube) to look for the meniscus of the water. You
do
> not need a float.

Alan, the tube is indeed transparent; glass. How can the meniscus be
detected?

I'm still looking at the different possibilities.

Regards,

Anand


>
> --
> http://www.piclist.com hint: The PICList is archived three different
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>

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http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.