Professional-Grade Breathalyzer Keychain
[[VIDEOID:f7745aa574961f7dbf89ba66e1146294]] The apparatus is appealing, and it gives the appearance of being functional. Before blowing, one has to be sure to take a long, deep breath, then continue blowing while listening for a shift in tone, and then blow for an additional two seconds after it sounds as though it is finished. A number of my pals were having trouble blowing correctly, so I suggested to them that they believe they are singing as they are blowing out since this is quite similar to maintaining a constant song note. It is straightforward to apply and seems to have a high degree of precision.
Rating: 5 stars