According to them, buying a tower in China as a gift for taking part in a study to spare resources in a non-sense. The answer of the EWZ mentions that less than 10 people of the 6000 participants complained and that the tower was made in China, but in a sustainable way.

While the choice of the EWZ was perhaps not the best, I still appreciate the movement and hope that people conducting the study will be able to focus on relevant matters - delivering us a great way to understand our electricity consumption and how we can reduce it!