Truth is that ISO 9001 and ISO 17025 have different purposes. ISO 9001 is about implementing a quality management system and is applicable to any kind of organization. Quality management systems can be certified by a certification body.
ISO 17025 is about “General laboratory competency of testing calibration requirements” and is applicable to laboratories that produce results, like composition of a sample, that can be used in a court of law. ISO 17025 main concern is competent, impartial, and consistent operation of laboratories. ISO 17025 is mainly used by calibration laboratories. Laboratories are accredited by an accreditation body.
The following material will provide you more information about ISO 17025: