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About PTB
- PTB – a brief presentation
- Divisions
- How to find us
- Charter of PTB (PDF, 9 KB)
- Deutscher Kalibrierdienst
Structure
- Presidential Board
- Presidential Staff
- Press and Information Office
- Divisions:
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Mechanics and Acoustics
Electricity
Chemical Physics and Explosion Protection
Optics
Precision Engineering
Ionizing Radiation
Temperature and Synchrotron Radiation
Medical Physics and Metrological
Information Technology

Scientific and Technical
Cross-sectional Tasks

Administrative Services
- Organization Chart (PDF, 100 KB)
- Deutscher Kalibrierdienst (DKD)
- Certification bodies
Thematic tours
- Guardian of the units
- In the service of the public
- Partner of industry
- In the worldwide network of metrology
- Questions about time
- Measuring man
What's new
- Press releases
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Calendar of events
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Lectures
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Archives
- Evaluation (PDF, 318 KB)
- Hermann-von-Helmholtz-Symposien (in German only)
- Press and Information Office
Publications
- Magazines:
- maßstäbe
- PTBnews
- PTB-Mitteilungen
Online-Magazine:
- In focus
- Brochures
Periodicals:
- Annual Reports
- PTB Texts
- PTB Reports
- PTB Testing Instructions
Books:
- Monographs
- Sicherheitstechnische Kenngrößen (in German)
- Hints for ordering
- Download
- Publications of the German Calibration Service, DKD
Jobs/Training
- Vacancies
- Possibilities of training (in German only)
- Staff Department
Services
- PTB services:
- Fees (in German only)
- Type approvals
- Certification bodies
- Products and services for PTB:
- Purchasing department (in German only)
- Technical advice: Divisions
- You don't know whom to contact?
The Presidential Staff Office will help you.
Contact
- Contact form
Links
- International metrology
- German research centres
- Scientific news

Search
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Imprint
- Imprint
The time
- The time
Fundamental constants
- Values of important constants
- Fundamental constants – a short introduction
- CODATA-Database (NIST)
-
Introduction to the constants for nonexperts (NIST)
- Fundamental constants and the SI
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