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Measurement conversion calculator for metric and imperial systems. Includes
metric charts, tables.
International Bureau of Weights and Measures (BIPM)
BIPM is an international standards organisation (one of the 3 organizations) to maintain the International System of Units (SI) under the terms of the Metre Convention.
USMA - U.S. Metric Association
Founded in 1916, it advocates U.S. conversion to the metric system.
Wikipedia - Metric System
Information about metric system, history, units.
Wikipedia - Imperial Units
Information about imperial system, history, units.
Wikipedia - U.S. Customary Units
Information about U.S. customary units, history.
Arbor Scientific is your source for science education supplies for physics,
physical science and chemistry. Workshop supplies, lab equipment and materials
for science demonstrations for school university and home school teachers.