A galvanometer, usually portable, for indicating the direction of a current.
A device capable of registering a specific substance or physical phenomenon, and that optionally sounds an alarm or triggers a warning.
An indicator showing the depth of the water in a boiler.
A measuring or displaying device.
A legal document, such as a contract, deed, trust, mortgage, power, indenture, or will.
A device used to produce music.
A means or agency for achieving an effect.
A tool, implement used for manipulation or measurement.
A person used as a mere tool for achieving a goal.
To devise, conceive, cook up, plan.
To perform upon an instrument; to prepare for an instrument.
To apply measuring devices.