The subject deals with the certification and testing used as a tool for conformity assessment for both regulated and non-regulated areas of products. The subject provides a way to assessment of the safe product properties under the New Legal Framework and European policy to ensure the proper functioning of the single market and the free movement of goods. The subject acquaints with accreditation and authorization systems and their application in testing and calibration laboratories. Attention is also paid to the development of standards within the EU and the Czech Republic. The principles of the certification process are demonstrated on specific products representing the selected product sectors.