7 -year guarantee testify to the highest care in the development of the products. In addition, our devices achieve top grades in independent tests and test methods. Our in-house quality management ensures compliance with the highest quality and security standards, which not only meets the common requirements, but also goes far beyond the generally applicable norms. Not only the materials and components used, but also the work and manufacturing processes within the company and the suppliers on site are checked- this enables a continuously high level of production. In this way, we have been offering our customers the greatest possible security in the usual premium quality for over 25 years.