With over 100 years of company history, the Zanger brand is a guarantee of quality and reliability for measuring microscopes.Founded in 1920 in the center of German optics in Wetzlar and now, in 2018, moved to the Franconian Lake District. With a new name and new ideas, TROSA GmbH continues to offer the well-known range of products from Zanger for research, teaching and industry.The combination of existing products, a modular system for individual microscope solutions, the development and simulation through optical design and the customer-specific software solution offer a perfect service for our customers. We only sell to traders / resellers.