Hello and no, the devices in the two-set are technically identical to the individual devices. With Netatmo (and other) set prices here, it is always worth comparing the individual price. Why the two is more expensive, I can only speculate: The purchase price of the set of two (even with Netatmo it is a separate item) was higher, they sell less and you don't want to blow the margin and the single item has a higher price-volume volatility, etc.