Professional accuracy Independent air vents and a backlit LCD display help isolate ambient air, gases and fumes when not in use, improving measurement reliability. Portable and easy to carry Compact, lightweight design that fits into a purse or pocket and is easy to carry for on the go testing. Simple to use Operation is fast and straightforward: press the button for 1 second to turn the unit on, a 10 second warm up follows, then a 3 to 5 second breath sample is blown into the breath inhaler for the test. Quality construction and power Constructed with quality materials and powered by two AAA alkaline batteries. Approximately 10 seconds after the results are displayed, the OFF symbol appears for 2 to 3 seconds and the unit turns off. 23 practical use scenarios Before driving or operating machinery to assess whether it is safe to continue or if you should wait. After a social event or gathering to determine if your level is within a safe range before leaving or making further plans. In a workplace or safetysensitive setting where a quick assessment is useful to ensure performance and safety.