A. Krüss Optronic GmbH is a German manufacturer and distributor of optical and electronic laboratory equipment as well as instruments for gemology.

In 1859, Edmund Johann Krüss, the son of Andres, expanded the company by adding a lens-grinding facility, to produce his own lenses for microscopes, photographic cameras and projectors.

His Manual of Electro Technical Photometry, written with his brother, chemical engineer Gerhard Krüss, became the standard reference work on this subject.

[7] As founder and first chairman of the Hamburg Society for Precision Engineering and Optics, Prof. Hugo Krüss also became involved as speaker for the photometric industry after 1891 and acted as a consultant for the German government.

The Senat of Hamburg awarded him the title of a professor in 1917, and one year later he was honored Doctor Honoris Causa by the University of Göttingen.

The company offers a great variety of stereoscopic and monocular instruments, dedicated to medical, biological, and technical applications, as well as photographic and video accessories.

Polarimeters for the analysis of solutions are available from a robust, manually operated laboratory device to fully automated computer driven sets.

Beside these main product groups, A.Krüss Optronic offers a variety of laboratory equipment, like flame-photometers, devices for spectral measurements, UV and analysis lamps, color sensors, and lab-software.

It includes gemological magnifiers and microscopes, special spectrometers and gem-refractometers, and complete battery-operated portable laboratories for field operation.