- . Altimeter–An instrument used for measuring altitudes in aircraft.
· Ammeter–An instrument for measuring electric currents in amperes.
· Anemometer–An instrument for measuring the force and velocity of wind.
· Audiometer–An instrument for measuring the intensity of sound.
· Audiophone–An instrument for improving imperfect sense of hearing.
· Barometer–An apparatus used for measuring the atmospheric pressure.
· Calorimeter–An instrument used for measuring quantities of heat.
· Carburettor–An apparatus used in an internal combustion engine for charging air with petrol vapour.
· Cardiograph–A medical instrument for tracing heart movements.
· Chronometer–An instrument kept on board ships for measuring accurate time.
· Crescograph–It is used for measuring growth in plants.
· Dynamo–The origin of electricity in a dynamo is the transformation of mechanical energy into electrical energy.
· Galvanometer–An instrument for measuring electric currents of small magnitude.
· Hydrometer–An instrument used for measuring the specific gravity of liquids.
· Hydrophone–An instrument for recording sound under water.
· Hygrometer–An instrument for measuring humidity in air.
· Lactometer–An Instrument for measuring the relative density of milk.
· Manometer–An instrument for measuring the pressure of a gases.
· Mariner's compass–An apparatus used by sailors to know the direction. The needle always points north-south.
· Microphone–An instrument used for converting sound waves into electrical vibrations and to magnify the sound
.
· Microscope–An instrument used for magnifying minute objects by a lens system.
· Odometer–An instrument by which the distance covered by wheeled vehicles is measured.
· Phonograph–An instrument for reproducing sound.
· Photometer–It is an instrument for measuring the intensity of light; a device for comparing the luminous intensity of sources of light.
· Polarimeter–An instrument used for measuring optical activity.
· Pyrometer–An instrument for recording high temperatures from a great distance.
· Radar–It is an abbreviated form of Radio, Angle, Direction and Range. It is used for detecting the direction and range of an approaching plane by means of radio microwaves.
· Rain Gauge–An apparatus for recording rainfall at a particular place.
· Radiometer–An instrument for measuring the emission of radiant energy.
· Refractometer–An instrument to measure refractive indexes.
· Seismometer or Seismograph–An instrument for recording earthquake shocks.
· Sextant–An instrument used for measuring the altitude of the sun and other heavenly bodies.
· Spectrometer–An instrument for measuring the energy distribution of a particular type of radiation.
· Speedometer–An instrument which indicates the speed at which a vehicle is moving.
· Spherometer–An instrument for measuring curvature of surfaces.
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