None. To my knowledge, none of the commercially available thermocouples (in std form can measure to 0.3C accuracy. The std limit of error for most types of thermocouples are larger than that. 0.5C to 2.2C is the typical range of accuracy specified for many Tc's to meet calibration spec. With repeated measurements at the same temperature though you can generate data for repeatably, but please do not confuse that with 'accuracy'. The entire measuring system must be calibrated, documented and measured to determine that (meter and probe).
If instead you are asking for a reference of a company that you can send a specific thermocouple to to have the calibration error and measurement checked at various temperature points, then that is a very different question. Specify the std you wish meet, then look up a metrology company in your local area that offers calibration services for the type of thermocouple (i.e. K, T or whichever type you have) and for the specific temperature readings/values you wish checked. Be sure and include the actual digital device used to measure and record the data from the thermocouple too (it will need to be calibrated and checked too) so you can receive the data for both devices, checked together, at the values you requested. Ask for "with data" reports and certificates so you will have the actual output values recorded for "before" and "after" data.
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