A Portable Breathalyzer
The Dräger Alcotest 3820 is the award winning compact design breathalyzer that making it more discreet and easier to transport (made in Germany). It's evidential breath testing device that offers responsible drivers a reliable way to take a breath alcohol-test & determine their breath alcohol lvl. Actually, It is a portable breathalyzer.
The breathalyzer ensures precise breath alcohol concentration (BAC) measurement technology identical to that used by law enforcement. source
The Alcotest 3820 features fuel cell sensor measurement tech that used for evidential work place and police testing. It also features the same sensor as the device used by the UK police. Overall, I think it is the best breathalyzer for personal use.
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