Instructions: 1: Press the power button 2: When the warm-up countdown is completed, please put your mouth as close as possible to the blowing nozzle (about 0.2 inches (5 mm)), and breathe for about 5 seconds 3: Electronic sound of the completion of the measurement will sound and display the measurement results. The measurement range is 0.000 - 1.000 mg/L. (displayed in 0.005 mg/L increments) [Caution] Can be used as an alcohol detector set by the Japanese National Safety Commission. This product comes with a cap for hygiene consideration**