Useful Links

National Institute of Standards and Technology-USA
http://tf.nist.gov

Japan Standard Time
http://jjy.nict.go.jp

Federal Physical and Technical Institute-Germany
http://www.ptb.de

National Physical Laboratory-U.K.
http://www.npl.co.uk

EM Microelectronic-Marin SA
http://www.emmicroelectronics.com

Bosch Sensortec
http://www.bosch-sensortec.com