About Precision Engineering Precision Engineering Division (PED) at NIST, providing the foundation of dimensional measurement that meets the needs of the industrial and scientific communities. What PED does Technical Programs PED Staff Products and Services Calibrations Standard Reference Materials Publications Engineering Metrology Toolbox Surface Metrology Algorithm Testing System Collaboration Opportunities Guest Researchers Postdoc Researchers SBIR Students Selected Programs Dimensional Metrology Nanomanufacturing Search Search NIST Webspace Search MEL Webspace Search PED Webspace Search NIST Staff Member Search U.S. Government's Offical Web Portal Search Federal Science and Technology Websites NIST Home Page PED Organization Division Office Large-Scale Coordinate Metrology Group Engineering Metrology Group Surface and Microform Metrology Group Nanoscale Metrology Group PED Research Areas Calibration Research: length, mass, force, acceleration, acoustical pressure, measurement uncertainty Coordinate and Machine Tools: CMMs, laser trackers, probes, performance, condition based maintenance Laser and Optics: interferometry, striae, air refractivity, surface finish, EUVL Surface and Nano: roughness, stylus instruments, interferometry, STM, AFM, SEM, linewidth, photomasks Dr. Michael T. Postek, PED Division Chief Privacy Policy, Security Notice, and Accessiblity Statement Disclaimer / Freedom of Information Act (FOIA) No Fear Act Policy / NIST Information Quality Standards NIST is an agency of the U.S. Department of Commerce. Date created: February 07, 2001 Last updated: Jul. 01, 2008 PED News Monthly Highlights Length—Evolution from Measurement Standard to a Fundamental Constant Time Line for the Definition of the Meter Gallery MEL News About MEL Research Areas Products and Services What's New MEL Gallery NIST News NIST Conferences and Workshops NIST Policy on Traceability NIST Time NIST Visitor Information and Directions NIST Staff and Programs How to Read PDF Files The PDF logo on the PED website means that you will need the lastest version of Adobe Acrobat® Reader to read and print documents presented in PDF format. Download a free copy from the Adobe Acrobat website. Technical inquiries: melwebmaster@nist.gov Manufacturing Engineering Laboratory NIST, 100 Bureau Drive, Stop 8200 Gaithersburg, MD 20899-8200 PED website comments: melwebmaster@nist.gov General NIST inquiries: (301) 975-NIST (6478) TTY (301) 975-8295