Fig. 1.
The Snap & Sniff® threshold test. The test kit is comprised of 20 smell “wands”. Five contain no odor and the others contain, in the case of the standard odorant phenyl ethyl alcohol, half-log stimulus dilutions ranging from 10−2 (strongest) to 10−9 (weakest) concentrations. When the thumb of the operator pushes the black ring forward, an odorized tip is presented to the subject. Releasing the ring retracts the tip back into the wand's housing. This test makes it impossible to touch the nose to the odor source. Photographs courtesy of Sensonics International, Haddon Heights, New Jersey USA. Copyright © 2017, Sensonics International.