Termination CHEK activities from 1 January 2018
From 1 January 2018 CHEK no longer provides proficiency studies and reference materials. The production and accreditation have been terminated. See also the letter that was sent to all customers.
The EPTIS database may help you find a new provider on proficiency studies.
The COMAR database may help you find a new provider on reference materials.
It is still possible to download reports of proficiency studies and certificates of reference materials.