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Limited website access on December 21st

Dear participants and visitors,

due to maintenance of the PTB network, access of the PTB Ex-Proficiency-Testing website might be limited on December 21st. Maintenance work will begin at 5 pm UTC and is scheduled to be finished at 6 pm UTC. This also affects the uploading and downloading of documents.

We apologize for any inconvenience,

PTB Ex-Proficiency Testing Team