Welcome to our website!
On this interactive site you will experience the 75-year success story of DIATEST Hermann Költgen GmbH.
From the foundation as a one-man business in 1948 to today's worldwide operating company.
Let us start the journey.

1948
Company foundation
1950
Move to Martinstraße in Darmstadt with 2 employees
1953
Now 15 employees.
Business relation with the company „Meßgeräte Bauer“ with trade name „Intast“.
1954
Foreman’s qualifying examination by Hermann Költgen
1973
25 years of DIATEST
Already working in the export with world-wide reputation
1974
In February 1974 Erna Költgen dies.
In November 1974 marriage with Sigrid Költgen.
In this period the responsibility is more and more taken over by Mr. Peter Zander.
High qualification and business thinking are decisive for his appointment as CEO.
The company develops very positively with his assistance.
1979
The death of Hermann Költgen strongly hits the company.
In the same year his widow Sigrid Költgen founds Hermann Költgen GmbH. Sigrid Költgen – shareholder & CEO – gives the company a solid base together with the CEO Peter Zander.
The expansion of the company is preconditioned. Trusting co-operation with our business partners and the production of high-quality measuring instruments lead to success.
1985
Daughter Gabriela joins the company on July 1st, after having successfully finished her training as a commercial employee
1988
On January 1st, academically trained engineer Mr. Klaus Orio joins the company as export manager.
He together with Astrid Junghans and Mr. Gösta Fehle, former export agent, successfully build up the export department at the factory within 6 months which has now worked independently since the 1st July, 1988.
1990
In October the shareholder & CEO Sigrid Költgen dies.
Through direct line of succession her daughter Gabriela Orio becomes shareholder of DIATEST and manages the company together with her husband Klaus Orio as CEO.
1992
The in-house measuring room is equipped
1995
The in-house CAD-facility is put into operation
1997
1998
After having put up the intranet, e-mail and internet are built up.
On May 10, the company gets a CNC-automatic lathe.
From May 14 to 17, DIATEST celebrates its 50th anniversary.
All representations are invited. Ceremony is on May 16, at Justus-Liebig-Haus, Darmstadt.
With pride an pleasure we look back at 50 years of DIATEST.
We continued the philosophy of our founder, Hermann Költgen. This is based upon quality, fast and punctual delivery times and fair partnership. These are the important targets for our company. Worth mentioning is, above all, the large personal involvement of our dealers for our products as well as our qualified employees who are guarantors for quality and reliable deliveries.
Our customers and our stuff members form together the big DIATEST-family. This feeling of partnership has guided us through ups and downs and made us become sucessful in the market. In the bore gauging sector we have reached a leading position on the world market. We look forward optimistically to the future having at the moment 70 employees and 43 country representations.
We are going to cultivate the idea of the big DIATEST-family and assure you of this partnership in the future.

2008
DIATEST do BRASIL Ltda.
Son Florian Orio joins the company
2010
DIATEST Cup 2010
In the DIATEST Velodrom, national and international cycling champions as well as Olympic participants were in the starting field. DIATEST has been promoting youth sports of the Velociped-Clubs 1899 Darmstadt e.V. (VCD) for many years and supports them in maintaining the race track - the DIATEST Velodrom.
The DIATRON1000 comes onto the market
2012
COME Métrologie S.A.R.L.
2013
Foundation of DIATEST Measuring Instruments (Beijing) Co. Ltd.
Foundation of DIATEST-Vertriebs-GmbH in Darmstadt
The new building - first construction phase
2014
Expansion of the management board
The new building - Second construction phase
Ground-breaking ceremony for 2nd construction phase - start of construction of the new production and office building in Darmstadt.
In front of our employees and numerous guests and dealers from Germany and abroad, the mayor of the city of Darmstadt and the president of the Chamber of Crafts honored the achievements of DIATEST in addition to CEO Dipl.-Ing. Klaus Orio.
2016
The new building complex
Grand opening ceremony for the new building complex
2017
Automation through robots
Presentation of the automated and robot-supported measuring cell for high-precision tactile measurement in the process, including digital measurement data transmission and evaluation.
Unique in the world of bore measurement!
First "Open House" day (TdOT) at DIATEST
Acquisition of COME METROLOGIE S.A.R.L.
2019
New calibration room of the highest grade
2020
Foundation of DIATEST Schober GmbH
Virtual Open Day (TdOT)
2021
The world's first DIATEST in-process measuring device - IPM
DLC Black Diamond - the latest standard
Investments in delivery capability
Due to worldwide supply difficulties caused by pandemics and other crises, DIATEST is investing large sums in its ability to supply:
New machines for a higher vertical range of manufacture
Increase of the material stock
Installation of its own hardening shop
In-house coating-line for DLC coating and calibration room
Environment and sustainability
Mitigating climate change and protecting the environment concern us all. That is why we are reducing emissions, cutting energy consumption and using natural resources responsibly.
Our measures for climate protection:
Thermal insulation of all buildings
LED lighting in all rooms
Installation of a combined heat and power plant
Collection and consumption of rainwater
Purchase of green electricity and green gas
We support the approach of a circular economy
2023
Solar power for DIATEST
Epilogue:
For 75 years, the family business DIATEST Hermann Költgen GmbH has stood for quality, delivery reliability and fair partnership.
Innovation was the driving force behind DIATEST and is still decisive for our success today. Customers who choose our products acquire 75 years of experience and know-how at the same time.
We will continue to strive to expand our global leadership position in the field of high-precision measuring instruments and complete metrological solutions.
This success is only possible together with our globally committed representatives, customers and qualified employees.
We will continue on our successful path and assure you of a fair and reliable partnership in the future.