11VERIFICATION AND CALIBRATIONThe BACTRACK is calibrated during manufacture using ad-vanced alcohol simulation equipment. Known alcohol concentra-tions are passed through the sensor to set baseline values fortesting. During testing, the unit compares users’ breath samplesto these baseline values.The accuracy of breath alcohol testers can fluctuate after six totwelve months of normal use, depending on the number of testsperformed and operating conditions.If this product is providing inconsistent test results, is not provid-ing any test results, or provides unusually high or low test results,the product should be recalibrated immediately by a trainedprofessional.The product should be recalibrated at least every six to twelvemonths. If the product is used every day, it may need to berecalibrated as frequently as every month.Calibration InstructionsPlease visit www.bactrack.com or call 877-334-6876 forinformation on how to get your BACTRACK Breathalyzerrecalibrated.During recalibration, a professional technician will reset thesensor baseline values and also perform a full diagnostic checkto ensure the accuracy and reliability of the product.