>same container in the same position for all your tests it might work ok = >change nothing in the setup but the contents of the container, so what you >see changing is just the effect of the contents, not anything else.
In that case, might want to glue the glass to a piece of wood, and mount the laser to the board. Would then be able to turn the whole thing over to pour out one sample and put another one in, without any change in position of the glass container relative to the laser. Gary ------------------------------------------------------------------ Horizon Technology Tomorrow's Technology Today http://www.eskimo.com/~ghawk/ Seattle, WA ------------------------------------------------------------------ Wondrous women Make me swim in Lofty thoughts alot. /-\-/-\-/-\-/-\-/-\-/-\-/-\
