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Krüss Optronic

Logo of A.Krüss Optronic GmbH
A. Krüss Optronic GmbH is a German manufacturer and distributor of optical and electronic laboratory equipment as well as instruments for gemology. The Hamburg-based company is one of the traditional Hanseatic family-owned enterprises and one of the oldest companies in Germany. It had its origins in the optical workshop of Mechanicus Opticus Edmund Gabory, founded in 1796.

A. Krüss Optronic has a branch office in the US, and representations in many countries of the world.


  • History 1
  • Products 2
    • Microscopes 2.1
    • Polarimeters 2.2
    • Refractometers 2.3
    • Density meters 2.4
    • Melting point meter 2.5
  • Gemology 3
  • References 4
  • External links 5


Edmund Gabory trained in London, with the most famous optician of his time, Jesse Ramsden. After some years in their own workshop in London, he and his family moved the business to Hamburg in 1796, where they could take advantage from the prospering seaport and trading center. In 1844, Edmund Garbory's assistant and son-in-law Andres Krüss founded his own company, and sold navigational instruments and nautical charts.[1] The two businesses were joined in 1886 into one company that exists until today. In 1859, Edmund Johann Krüss, the son of Andres, expanded the company by a lens-grinding facility, to produce his own lenses for microscopes, photographic cameras and projectors. He demonstrated the quality of his products in his own photographic studio. Edmund Johann constructed early cross-fading slide projectors and got a patent for the famous magic lantern, a forerunner of movie projectors, in 1865.[2] From 1888 to 1920, the company was managed by Prof. Hugo Krüss, son of Edmund Johann, who did fundamental work on the theory and application of photometry. His Manual of Electro Technical Photometry became the benchmark of this realm.[3] He transformed the enterprise from a manufacturer of scientific instruments into a technological pacemaker who set standards, e.g. in colorimetry.[4] As founder and first chairman of the Hamburg Society for Precission Engineering and Optics, Prof. Hugo Krüss also got involved as speaker for the photometric industry since 1891 and acted as a consultant for the German government.[5] In this role, he convinced the government to establish a special customs tariff for scientific instruments. 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.[5] In 1930, the City of Hamburg named a street after him.[6]

Grand Prix of the World Exhibition, Brussels 1910
Hugo’s son, Dr. Paul Krüss joined the company at the age of only 24 and continued the work of his father. He was called master craftsman with a doctorate[7] as he developed new physical measurement methods and also constructed the necessary equipment. Paul Krüss led the company through the stormy times of the twentieth century. After World War II, he handed the management over to his son Andres, who won a great number of new international customers during the German economic miracle.

The continuity of family leadership has been carried beyond the twentieth century. Since 1980, Martina Krüss-Leibrock has been head of the company. Her daughter Karin Leibrock joined in 2005. With her entry, the enterprise has been family-run for eight generations.[7] In February 2009, A. Krüss Optronics moved to a new building close to the Hamburg Airport.



Microscopes traditionally are the core product of A. Krüss Optronic. 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. Krüss also offers automatic portable polarimeters for quick precise measurements in the field, e.g. for incoming inspections.


Refractometers are provided for measurement of the refraction index of liquids as well as polymers. Desk-Top and electronic portable refractometers can be used for many applications in the food and chemical industry.

Density meters

The (mechanical) density is a typical parameter of each compound. A. Krüess Optronic offers digital density meters with an accuracy up to 0.00005 g/cm3. All are compliant to GLP/GMP and ASTM-standards. Results and parameters are displayed on integrated touch-screens and may be delivered through different computer interfaces.

Melting point meter

The melting point is specific characteristic of a substance. A.Krüss Optronic provides a fully automatic melting point meter for powdery substances. With the device, melting points up to 400 °C can be examined.

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.


A specialty of A.Krüss Optronic is their program of gemological instruments and equipment. It includes gemological magnifiers and microscopes, special spectrometers and gem-refractometers, and complete battery-operated portable laboratories for field operation.


  1. ^ Museum optischer Instrumente
  2. ^ Museum optischer Instrumente During the next decades, the products of the company were presented at many trade fairs and awarded prizes e.g. at the World Exhibitions in Paris (1855), London (1862), Chicago (1893), Paris (1900), Saint Louis (1904) and Brussels 1910.A. Krüss Optronic GmbH History of A. KRÜSS Optronic, retrieved February 10th, 2010
  3. ^ Hugo Krüss: Die elektro-technische Photometrie,Band 32, Elektro-technische Bibliothek, A. Hartleben's Verlag, 1886
  4. ^ Gerhard and Hugo Krüss: Kolorimetrie und quantitative Spektralanalyse in ihrer Anwendung in der Chemie, 1891, Leopold Voss, Hamburg
  5. ^ a b Hamburger Gesellschaft für Feinmechanik und Optik - Historie der Gesellschaft, 2006, retrieved February 12th, 2010
  6. ^ Johannes Gerhardt: Die Begründer der Hamburgischen Wissenschaftlichen Stiftung, 2007, Hamburg University Press, Verlag der Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, ISBN 978-3-937816-35-7, P. 84
  7. ^ a b A. Krüss Optronic GmbH History of A. KRÜSS Optronic, retrieved February 12th, 2010

External links

  • Official website

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