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Definition of instrument
1a tool or implement, especially one for delicate or scientific work:a surgical instrument writing instruments a thing used in pursuing an aim or policy; a means:drama as an instrument of learning a person who is exploited or made use of:he was a mere instrument acting under coercion 2a measuring device used to gauge the level, position, speed, etc., of something, especially a motor vehicle or aircraft.
3 (also musical instrument) an object or device for producing musical sounds:a percussion instrument 4a formal document, especially a legal one:execution involves signature and unconditional delivery of the instrument
verb [with object]
equip (something) with measuring instruments.