Calibration certificates for the VFC Log Tag Thermometers are valid for around two years before expiring. Florida SHOTS will notify your office 30 to 60 days prior to the expiration date, and you will also see a red exclamation mark next to the “Calibration Log” menu option on the “Temperature Log” page in Florida SHOTS. Click HERE to download step-by-step instructions on getting your Log Tag recalibrated.