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The first types of weighing scales consisted of a beam with a fulcrum at its center. For highest accuracy the fulcrum would consist of a sharp V-shaped pivot seated in a shallower V-shaped bearing. To determine the mass of the object, a combination of reference weights was hung on one end of the beam while the object of unknown mass was hung on the other end. For high precision work the center beam balance is still one of the most accurate technologies available, and is commonly used for calibrating test weights. Scales are used in a wide range of industries, from trucking to construction to medical devices. Scales can be purchased wholesale from a variety of sources.
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