Lab rat chamber for studying rodent metabolism.
https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...951#post202781
https://www.homemadetools.net/forum/...690#post201699
https://www.homemadetools.net/forum/...918#post144640
https://www.homemadetools.net/forum/...092#post164922