Answer:
This device doesn't come with a calibration certificate however it is tested for accuracy during the manufacturing process.
We aren't able to offer calibration on single use products because they can only be started once. We can provide you with a certificate of accuracy which will come from the manufacturer if you make the request in the notes order comments field during checkout.
We sell a multi-use version of this same logger that can be calibrated - https://www.microdaq.com/logtag-direct-usb-temperature-data-recorder-pdf-reports.php