To ensure optimal performance, all breathalyzers must be calibrated periodically. Calibration is a process in which a trained technician adjusts the software inside the breathalyzer so that it measures BAC levels accurately.
Over time, as a breathalyzer is used, its sensor becomes saturated, and the results of the device can drift. You can think about it like resetting a clock: though you set the time accurately when you first get it, as time passes, it can gradually drift by a few minutes, and eventually can be off by a reasonable amount.
NOTE: BACtrack products purchased in Australia and New Zealand cannot be calibrated by BACtrack.com. For calibration in Australia, please click here. For calibration in New Zealand, please click here.