As for sensor calibration, this is a non-trivial issue. Calibration of temperature measuring instruments is generally not correct terminology. Why do we say so? You can find an explanation of this in the "I have a problem..." section of this FAQ. Please see the public links we provide there as well. Please also review some questions about sensor accuracy in this section. The sensor is accurate, but you cannot get a certificate from us. It makes no sense to do so-called calibration for things that cannot be calibrated in principle. A so-called calibration must be done for a specific application compared to another temperature sensor that you or your auditors trust (or better say "like"). It also doesn't make sense from a regular calibration point of view, since you can't ship the units to us and we can't come to you. Starting with firmware v.2, we provide the ability to add a calibration value through your iSocket IoT Portal on the temperature monitoring widget when you click "Settings" (you will see a note "Update required" in case you do not have the correct firmware and you can update it first). Thus, you can contact any laboratory that you trust or that your auditors approve and discuss the matter with them. They may regularly come to you (according to your local policy, regulations or requirements) with instruments they think are good and tell you the deviation from current readings (in degrees Celsius in 0.1 increments). You must enter this value into the calibration settings and show them new readings. They will then confirm the new readings and you are considered audited / calibrated for a period defined in your requirements. The sensor will not show data worse over time. It cannot degrade, it can only break. However, your auditors may disagree and even tell you next time that you need to recalibrate. This is the whole non-triviality of the issue - that calibration is a "manipulation" of indications for inspectors.