To measure, place one of the mouthpieces in the blowhole, then simply press the TEST button until the device switches on. The screen will show WAIT and count down from 10 to 0, then BLOW and C-C-C will be displayed. Take a deep breath and blow evenly into the mouthpiece for 3-5 seconds.The measurement result will be displayed for a few seconds, HI will appear on the display if the measurement range is exceeded. The breathalyser switches off automatically. Display: LCD display with backlight Dimensions: 105x45x24 mm Weight: 90 g without battery Type of sensor: solid-state Measurement method: Air sample in ‰ (g/l) Measurement range: 0.00‰ to 4.00‰ (i.e. 0.00 to 2.00 mg/l or 0.00 to 0.40 BAC) Accuracy: +/- 0.15 for 0.50% BAC Precision of the reported result: up to 0.01‰ Set-up time: 15 s Result delivery time: up to 10 s Exhalation time during measurement: 10 s Time to retest: less than 60 s Working temperature: 10°C - 40°C Power supply: 2 x AAA alkaline batteries (1.5 V), included Battery life: approximately 200 measurements Calibration: every 6 months