They are excellent for checking the tyndall effect.  I use them exclusively for
that.  BTW, ebay is down, hit by a virus FNN said.

Marshall

tosca...@ix.netcom.com wrote:

> On 06/11/99 16:44:51 you wrote:
> >
> >There are tons on the auctions Ebay.com. I bought a metal one for $11 sells
> >for $50 at radio shack.
> >Tami
> >
>
> Perhaps I missed something, but what are the practical applications
> of laser devices in relation to CS?
>
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