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Calibration is recommended every 150 uses or every 4-6 months. The sensor needs replacement every year or 500 uses in total. The cost of sensor replacement is included in calibration. The breathalyser Calibration is completed at our factory and allows the breathalyser to retain its accuracy even after hundreds of tests. Other products that do not offer calibration tend to lose accuracy over time and will not give accurate readings. Calibration provides greater accuracy in readings with increased reliability. This price includes return shipping and calibration is normally completed within a week.