Scientific Instruments and Their Purpose

by Vinodh Reddy


Scientific instruments are used for scientific purposes. Scientific Instruments are specifically designed, constructed and refined for their purpose. Over time, instruments have become more accurate and precise.

Various scientific instruments and their purpose are briefly described below.

Actinometer: Actinometer is a device that measures the heating power of radiation.

Altimeter: Altimeter is a special type of aneroid barometer, used in measuring altitudes.

Ammeter: Ammeter is used to measure strength of an electric current.

Anemometer: Anemometer is used to measure velocity and find direction of the wind.

Audiometer: Audiometer is used to measure difference in hearing.

Barometer: Barometer is used to measure atmospheric pressure.

Calorimeter: Calorimeter is used for measuring quantity of heat.

CAT Scanner: CAT Scanner is used to create 3-D image of the body issued by X-ray pictures.

Chronometer: Chronometer is a clock to determine longitude of a vessel at sea.

Clinical Thermometer: Clinical Thermometer is used for measuring temperature of human body.

Colorimeter: Colorimeter is used for comparing intensities of colours.

Commutator: Commutator is used to change or reverse the direction of an electric current. In dynamo, commutator is used to convert the alternative alternating current to electric current.

Dynamo: Dynamo is used for converting mechanical energy to electrical energy.

Dynamometer: Dynamometer is used for measuring electric power.

Electrocardiograph (ECG): Electrocardiograph is used for detection of electric pulses of the heart. It gives a graphic picture of heartbeats.

Electroencephalograph (EGG): Electroencephalograph is used for recoding of change in electric potential in various area of the brain by means of electrode on the scalp or in the brain itself.

Electrometer: Electrometer is used for measuring electric charge or electrical potential difference.

Electroscope: Electroscope is used for detecting presence of electric charge.

Endoscope: Endoscope is an instrument used for examining hollow organs such as the bowel.

Galvanometer: Galvanometer is an sensitive ammeter.It used for measuring small electric current.

Hydrometer: Hydrometer is used for measuring relative density of the atmosphere.

Hydroscope: Hydroscope is an optical instrument used for viewing objects below the surface of water.

Hygrometer: Hygrometer is an instrument used for measuring relative humidity of the atmosphere.

Hygrocope: Hygrocope is used to show changes in the atmosphere humidity.

Lactometer: Lactometer is used for measuring the relative density.

Manometer: Manometer is used for measuring the pressure of gas.

Magnetometer: Magnetometer is used to compare magnetic moments and fields.

Megaphone: Megaphone is used for carrying sound to long distances.

Microphone: Microphone is used for converting sound waves into electrical energy which is transmitted through wires and then recovered into sound in a magnified intensity.

Microscope: Microscope is used for magnified view of every small objects.

Optometer: Optometer is an instrument used for measuring the distance of distinct vision, mainly for the selection of eye glasses.

Peizometer: Peizometer is an instrument used for measuring the pressure, especially high pressures.

Photometer: Photometer is used for comparing luminous intensity of the sources of light.

Pyrheliometer: Pyrheliometer is an instrument used for measuring solar radiations received by the earth.

Pyrnometers: Pyrometers are used for measuring high temperatures.

Radar: Radar is used for detecting and finding range of moving objects by transmitting beams of radio waves.

Radio micrometer: Radio micrometer is used for measuring heat radiations.

Rain gauge: Rain gauge is used for measuring rainfall.

Refractometer: Refractometer is used to measure refractive index of a substance.

Resistance thermometer: Resistance thermometer is used for determining electrical resistance of conductor.

Seismograph: Seismograph is used for recording intensity and origin of earth shocks.

Sextant: Sextant is used for measuring the altitudes of celestial bodies to determine latitude and longitude.

Spectroscope: Spectroscope is an instrument used for spectrum analysis.

Sphygmomanometer: Sphygmomanometer is used for measuring blood pressure.

Sphygmometer: Sphygmometer is used for measuring strength of the pulse.

Stethoscope: Stethoscope is a medical instrument used for hearing ad analysing the sound of heart and lungs.

Telescope: Telescope is used for viewing distant objects as magnified.

Thermometer: Thermometer is used to measure the temperature.

Thermostat: Thermostat is a device used for regulating constant temperatures.

Variometer: Variometer is used for measuring the rate of climb or descend of an aircraft.

Viscometer: Viscometer is used for measuring viscosity.

Voltmeter: Voltmeter is used to measure potential difference between two points.