If your breathalyzer is providing inconsistent test results, is not providing any test results, or provides unusually high or low test results, the product should be calibrated immediately by a trained professional. Not calibrating the unit per the suggested time frames can harm the sensor.
Pro Grade Breathalyzers (such as the BACtrack S80 Pro, Trace Pro, or Mobile Pro) hold calibration longer than do the non-Pro Grade units (such as the BACtrack GO, or Keychain). BACtrack recommends that you calibrate your Pro Grade breathalyzer at least every 12 months, while the non-Pro Grade units may need servicing closer to every 6 months; depending on the performance you observe and require. If the breathalyzer is used every day, it may need to be calibrated more frequently.
You can submit your device for calibration by clicking the link below.