A very compact & useful gadget to protect yourself & others from the dangers of 'drink driving' either on the night or the morning after. Using Advanced Semiconductor Oxide Technology (ASC) this portable gadget will quickly & accurately measure the alcohol content of your blood, with a bright backlit display you can easily see the results even when in a dark environment. It has a quick 'warm up' time of only 10 seconds & gives you your result in under 5 seconds. You should always take your measurements a good 20 minutes after your last drink, so it is actually measuring your ' Blood Alcohol Content', & not just the concentration of alcohol in your mouth. Also great for making sure your 'designated driver' is sticking within the legal limits, drink drivers aren't just risking their own safety! Because of its portable size its easy to keep in a pocket, handbag, or glove box of your car. Sensor: Advanced semiconductor oxide alcohol sensor Range: 0.00%-0.19% BAC (0.0-1.9g/l or 0.00-0.95mg/l BRAC) Accuracy: 0.01% BAC (0.1g/l) Power: battery 2 x 1.5V "AAA" alkaline battery (supplied) Operating time: Warm up: 10s, response: