The standard ISO/IEC 17025 requires that a laboratory shall have access to equipment that is required for the correct performance of laboratory activities. In particular, calibration programmes shall be established, reviewed and adjusted, including intermediate checks to maintain confidence in the calibration status. In order to guarantee harmonised interpretation and application of ISO/IEC 17025 requirements within the OMCL Network, the guideline “Qualification of Equipment” has been elaborated. This document should be considered as a guide to OMCLs for planning, performing and documenting the equipment qualification process. It contains the general introduction and general forms for Level I (Selection of instruments and suppliers) and Level II (Installation and release for use) of qualification, which are common to all types of equipment.