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The balance (also balance scale, beam balance and laboratory balance) was the first mass measuring instrument invented. [1] In its traditional form, it consists of a pivoted horizontal lever with arms of equal length – the beam or tron – and a weighing pan [10] suspended from each arm (hence the plural name "scales " for a
Hoptroff London watches are advertised by the company as "The most accurate timepieces in the world”. Its atomic timepieces use chip scale atomic clock technology, [14] where a small vessel of Caesium 133 is exposed to 130 °C. [15]
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A spring scale measures force but not mass, a balance compares weight, both require a gravitational field to operate. Some of the most accurate instruments for measuring weight or mass are based on load cells with a digital read-out, but require a gravitational field to function and would not work in free fall.
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So, the inclusion of a metric scale requires the measuring device either to contain 3 scales of measurement or the elimination of one of the US Customary scales. The use of millimeter only tape measures for housing construction is a part of the US metric building code. [25] [26] This code does not permit the use of centimeters. Millimeters ...
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