Digital alcohol test with audible alert Range: 0.00-0.19% BAC & 0.0-1.9g/l Quick response and resume Auto power off Use 2 x alkaline batteries (NOT included) Easy to use and Carried conveniently It can ensure your driver is safe HOW it Works 1)�Press the power button once ,the alcohol tester LCD will turn on with one beep sound. 2) The warm up symbol is displayed and the 10 to 1 countdown begins that indicates the tester is in warm-up mode. 3) The "blow " symbol is displayed when warm-up is complted, and the 10 to 1 countdown starts again to show that it is in testing mode. 4) Blow into the breath inhaler for 3-5 seconds. 5) Read the testing result from the alcohol tester LCD.
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