An instrument is a concrete or abstract tool intended for a purpose other than mechanical work, in particular a refined one.
Musical instruments are devices designed to produce music, frequently by plucking or striking a string or bell or drum surface, or by forcing air to resonate (see wind instrument).
Scientific instruments are devices intended to assist in the conduct of science. An example would be the test tubes and other glassware one might find in a chemistry or biology laboratory.
Analytical instruments are devices used to measure multiple or complex material properties, such as mass spectrometers.
Medical instruments are devices for the diagnosis and treatment of diseases, such as stethoscopes.
Legal instruments are documents used to formally document various types of transactions or confirm certain statuses for specific purposes, such as confirming contractual relations, civil status, etc. Examples include wills, writs, court order, contracts, treaties, marriage licenses and driver's licenses.
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Instrumentation is defined as "the art and science of measurement and control".
Instrumentation can be used to refer to the field in which Instrument technicians and engineers work, or it can refer to the available methods of measurement and control and the instruments which facillitate this.
Instrumentation Engineers largely design control and measurement systems primarily for industrial processes, although instruments are present in almost any modern technology today including vehicles, computers, appliances etc.
Orbiter operational instrumentation is used to collect, route and process information from transducers and sensors throughout the orbiter and its payloads.
Instrumentation equipment, except sensors and selected dedicated signal conditioners, is located in the forward and aft avionics bays.
Its instruments continually sense the dynamic X, Y and Z attitudes and the performance characteristics of the orbiter during the launch, orbital, entry and descent phases of flight.