It measures up to a blood alcohol level of 0.2% - above that and you probably won't be able to walk. Response time is less than 8 seconds - all you do is wait about 10 seconds then blow into the sensor to give a reading in blood alcohol percentage or mg/litre.  Requires 2 x AAA batteries. Compact purse or glove box size

• <8 second response time
• Low battery indicator
• Backlit LCD
• Measures: 103(L) x 37(W) x 19(H)mm

Please note: this product is intended to give an indicative reading only and is carries no guarantee of accuracy. Jaycar accepts no responsibility for any consequence arising from the use of this device.