Breathalyzers without mouthpiece

No mouthpiece

— models that do not use a mouthpiece: when measuring, just blow into the hole on the body. The main advantage of such devices is simplicity and ease of use: no need to bother with the sterilization of reusable mouthpieces or spend money on disposable ones. On the other hand, the accuracy and reliability of such models is noticeably lower than that of mouthpiece models: not only exhaled, but also ambient air enters the device, and the sensor can react not only to alcohol, but also to foreign impurities. In advanced devices, this disadvantage can be compensated by the use of high-precision sensors, but the accuracy of such models is still lower than that of mouthpieces. And most breathalyzers with this type of blowing belong to the low-cost category.