You don't have to worry about getting more. The response time is 20 seconds which means you can obtain accurate readings from several different people quickly. The Tester also comes with a car cigarette lighter adaptor to save the battery life of the unit. The unit comes with five washable, re-usable mouthpieces and is compact enough to fit in your pocket or vehicles glove box. Weather your wanting to make sure you are safe to drive home, or want to make sure your friends partying as hard as you are this tester delivers time and time again.
All prices are subject to change.