The Ace A breath alcohol tester provides police-accurate results thanks to its electrochemical sensor, with a measurement tolerance of ± 0.075‰. The device features a flow sensor to determine the breath volume, which measures the alcohol concentration in your breath and calculates the blood alcohol concentration from it. Due to its handy size and compact weight, the alcohol tester is the ideal companion for events where alcohol is consumed. You can also use the device the next morning to check your residual alcohol level. Operation is done via a single button located on the front of the device, which can be easily accessed by both right- and left-handed users.