ETH card
Immediately after admission and enrolment/registration, the ETH card is printed and sent by post. If you already have a valid ETH card, it can be revalidated at any validation terminal afterwards.
Check on the webpage about the ETH card where those validation terminals are located.
If you need a new ETH card, you can order it at the webshop.
The ETH card also serves as your library card. All members of ETH Zurich are automatically clients of the ETH-Libraries.