Kann ich eine MTCI-Einheit kaufen und zwischen den Kammern wechseln?

The answer is yes and no.

Yes, if those chambers use the same communication protocol.

For example, Votsch VT4002 and Weiss WT20/40 use the Votsch L4006 protocol. If you have these two chambers, you only need one MTCI unit.

However, if you have another chamber like Espec SU-241 that uses the Espec SCP220/SCP-N300/SCP310 protocol, you need to purchase another MTCI unit.