The BestDealUSA LCD Display Semiconductor Alcohol Sensor Breath Alcohol Breathalyzer has good ratings on Amazon shopping website. It is available to buy at an affordable price. The main features are digital display, alert, lightweight and many others . The BestDealUSA LCD Breathalyzer has an advanced semi-conductor oxide alcohol sensor that delivers fast response, and it comes with auto power-off feature after one minute. It has a detection range of 0.00-0.19% BAC while warm-up time is just 10 seconds, blowing time 5 seconds and it can be operated in environmental temperature of 10~40. Power supply: 2x 1.5v with AAA batteries (in this product battery is not included). The pack contains 1 alcohol breathalyzer and 4 attachments; shipping weight is of 4 ounces.
Personally this device is very good, it has been a bit of a party favorite wherever I go, and it comes with an advanced feature of alarming you have crossed the limit of drinking alcohol.