1. Wait at least 20 minutes after eating or drinking before testing. Alcohol remaining in the mouth, or even excess saliva, may interfere with testing. This includes alcohol-based mouthwash or similar products.

2. Avoid testing in high wind or enclosed spaces. Poor ventilation may also lengthen the time required for warm up between tests.

3. Do not blow smoke, saliva or other contaminants into the mouthpiece, as the sensor may become damaged.

4. Do NOT use any breathalyzer as a tool to drink and drive.

5. Keep out of extreme temperatures and out of the reach of children.