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the test, you must press and hold the POWER button of the power switch and not let go. 2. If it is not used for a long time, the red light or yellow light will be on for a long time during the test. If a similar situation occurs, please press the POWER button of the power switch to try several times. 3. If the battery power is insufficient, the red and yellow lights will be on for a long time at the same time during the test. Please replace the battery at this time. 4. Do the test after drinking alcohol for at least 20 minutes, as it takes about 20 minutes for alcohol to be absorbed from the digestive system into the bloodstream. Tested immediately after drinking, the results can only reflect the alcohol concentration in the mouth at that time, not the alcohol concentration in the blood. 5. In order to make the test results more accurate, the test time is preferably more than 3 minutes from the last test. 6. Try not to smoke and drink like tea, coffee or other stimulating beverages before the test. 7. Do not use chemicals to clean the tester directly to prevent liquid from flowing into the blowpipe. 8. It is strictly forbidden to place and use paints, pesticides, alcohol and other accessories.
