The ACE Instruments AFM-5 is an easy-to-use alcohol measuring device with an electrochemical sensor that is used in combination with a smartphone. Before conducting the test, the "Alcofind" app must be downloaded from the App Store or Google Play and installed on the smartphone. The ACE Instruments AFM-5 measures the alcohol concentration in the breath and calculates the blood alcohol concentration from it. The measured results are displayed as a 4-digit numerical value with 3 decimal places when using the breathalyzer in conjunction with the app on your smartphone and can be interpreted 1:1 (for example, the display shows the value 0.36 = 0.36 per mille). All measurements obtained from this alcohol testing device are for reference only and are not legally binding. Breath tests should be conducted using disposable mouthpieces (1 new mouthpiece should be used per test). The electrochemical sensor cell promises extremely accurate, fast, and consistent measurements of the alcohol content in your breath. The breathalyzer is applicable via Bluetooth connection on almost any smartphone. The free app allows you to perform various analyses, such as testing breath alcohol with friends, sharing measurement results, monitoring alcohol tests, setting limits, and much more. This tester for determining the blood alcohol level in the breath is so small that it can hardly be noticed in any shirt or pants pocket. This smartphone tester is ideal for responsible individuals who rely on accurate measurements in their leisure time, profession, or while driving.