Affordable nitrogen fixation measurement (coming soon)
My goals are: 1) to make measuring biological nitrogen fixation and related variables inexpensive enough for even poorly-funded researchers, schools, students, and hobbyists, and 2) to encourage current and future researchers and inventors to collaborate in ways that advance both agriculture and our environment. Initially, therefore, the PI will be sold as a bare printed-circuit board (designed in my basement workshop in Minnesota), with free documentation on how to add as few or as many components as needed for your applications.
Pretty Good Philosophical Instruments 