Optimal device for recording and documenting of temperatures in the private sector

After a long search, I came across this Thermologger TFA303039 who has in my opinion a very good price-performance ratio. Commissioning is simple and the Speicherkapazät for measuring results more than sufficient. The associated software can be downloaded from the manufacturer's website and was easy to install and configure. The SW is kept simple, evaluations makes it better in a spreadsheet program (eg Excel). Export and import of data is very simple.
I have to buy a transmitter TFA303180 whose measurements are recorded from this unit. As expected, the two devices at the same temperature (~ 20 °) a small deviation of the measured result. This is by 0.3 ° C but in the context.
Both devices have indicated an accuracy of + -1 ° C. More can not be expected from a device of this price range. I was hoping that there is a way to pre-compensate the offset. Unfortunately, this is not provided, however. Of course, it's easy to make this compensation later in the evaluation, therefore I did not let it be included in the evaluation.
Of particular note is the support that has supported me exemplary in measuring the accuracy of the equipment.