It is possible to get our ThermITs temperature sensor accreditated, which shows that the accuracy is within the limit of documentation.
ThermIT has accreditated sensors in stock, and you can rent these and do the calibration yourself. They come with a special bracket, which connects together with the sensor you already have, and within one hour, you will recieve a document, telling you that the sensors have three measurement that are within the limit of documentation, and the sensor is measuring correctly.