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A measuring instrument is a device to measure a physical quantity. In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantities of real-world objects and events. Established standard objects and events are used as units, and the process of measurement gives a number relating the item under study and the referenced unit of measurement. Measuring instruments, and formal test methods which define the instrument's use, are the means by which these relations of numbers are obtained. All measuring instruments are subject to varying degrees of instrument error and measurement uncertainty.\nThese instruments may range from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators. Virtual instrumentation is widely used in the development of modern measuring instruments.

The finances of the British royal family come from a number of sources. The British government supports the monarch and some of his family financially by means of the Sovereign Grant, which is intended to meet the costs of the sovereign's official expenditures. This includes the costs of the upkeep of the various royal residences, staffing, travel and state visits, public engagements, and official entertainment. Other sources of income include revenues from the Duchies of Lancaster and Cornwall, income from assets of other trusts, income from private investments, and a parliamentary annuity.