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1.After drinking,it is recommended to wait 20 minutes before testing,because alcohol takes about 20 minutes into the blood from the digestive organs,and residual alcohol in the mouth takes time to dissipate. 2.To get a more accurate result,the distance should be at least three minutes between each test. 3.Do not use benzene,gasoline and thinners cleaning product ingredients tester . 4.Do not allow any liquid penetrated into the sensor. 5.To you and the safety of others,do not drink and drive.