Charlie,

Here is a link:
http://www.orthokineticscorp.com/migma.htm

The distributor is in California. Navigate your way back to the home page.

If it is like the one shown, the bottle cracks while the measuring device is
good. You should be able to find and modify a sports or lab reagent bottle to do
the same thing using the measuring device. As an alternative you will find a
standard sized cap for wine makers (used for air locks) that can be modified to
do the same thing on a plastic bottle.