The voluntary testing of plant protection equipment by the Federal Biological Research Centre for Agriculture and Forestry covers not only the technical examination but also extended field tests. An agreement amongst national testing stations in the European Network for Testing of Agricultural Machinery (ENTAM) is an important basis for joint tests in the future. Until recently, obligate testing of plant protection equipment was only established in Germany. Standardisation at European and international level has been strongly intensified over the last few years. Therefore a multitude of EU-/ISO-standards are now available. The paper describes the ways of testing plant protection equipment in Germany in connection with the latest efforts to harmonise the relevant regulations at EU level.