Field olfactometer used to detect and measure odor strength in the air.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...factometer.jpg
Previously:
https://www.homemadetools.net/forum/...894#post160120
https://www.homemadetools.net/forum/...614#post159165
https://www.homemadetools.net/forum/...743#post159676
https://www.homemadetools.net/forum/...433#post158454
