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SPEEDY Railway Book (English)

Lists of Measuring Instruments For SSC & Railway

Lists of Important Measuring Instruments

Name of the Instrument
Used For
Altimeter
Measures altitudes (used in aircraft)
Calorimeter
Measures quantities of heat.

Dilatometer
Measures changes in volume of substances
Hygroscope
Shows the changes in atmospheric humidity
Magnetometer
Compares magnetic movements and fields
Electromicroscope
To obtain a magnifying view of very small objects Capable of magnifying up to 20,000 times
Audiometer
Measure intensity of sound
Callipers
Measure inner and outer diameters of bodies
Microphone
Measure distances/angles
Techeometer
A theodolite adapted to measure distance, elevations and bearings during survey
Stereoscope
To view two-dimensional picture
Spectroscope
To observe or  record spectra
Radio micrometer
Measures heat radiation
Sextant
Used by navigators to find the latitude of a place by measuring the elevation above the horizon of the sun or another star; also used to measure the height of very distant objects
Wattmeter
To measure the power of an electric circuit
Venturimeter
To measure the rate of flow of liquids
Pyknometer
Determines the density and coefficient of expansion of liquids
Ammeter
Measures strength of electric current
Bolometer
To measure heat radiation
Lactometer
Measures the relative density of milk to determine purity
Hygrometer
Measures level of humidity
Fathometer
Measures depth of the ocean
Dynamometer
Measures electrical powr
Cryometer
Atype of thermometer used to measure very low temperatures, usually close to 0oC
Spherometer
Measures curvature of spherical objects
Techometer
To determine speed, especially the rotational speed of a shaft (used in aeroplanes and motor-boats)
Wavemeter
To measure the wavelength of a radiowave
Thermometer
Measures Temperature
Ultrasonoscope
To measure and use ultrasonic sound (beyond hearing), use to make a Ecogram to detects and abnormal growth
Voltmeter
To measure electric potential difference between two points
Radar
To detect the direction and range of an approaching aeroplane by means of radiowaves, (Radio, Angle, Detection and Range
Viscometer
Measures the viscosity of liquid
Pyrometer
Measures very high temperature
Quadrant
Measures altitudes and angles in navigation and astronomy
Salinometer
Determines salinity of solutions
Thermostat
Regulates temperature at a particular point
Udometer
Rain gouge
Vernier
Measures small sub-division of scale
Spectrometer
Spectroscope equipped with calibrated scale to measure the position of spectral lines (Measurement of refractive indices)
Ondometer
Measures the frequency of electromagnetic waves, especially in the radio-frequency band
Polygraph
Instrument that simultaneously records changes in physiological processes such as heartbeat, blood-pressure and respiration; used as a lie
detector
Telemeter
Records physical happenings at a distant place.
Telescope
To view distant objects in space
Transponder
To recives a signal and transmit a reply immediately
Periscope
To view objects obove sea level (used in submarines)
Refractometer
Measures refractive indices
Stroboscope
To view rapidly moving objects
Electroscope
Detects presence of an electric charge
Endoscope
To examine internal parts of the body
Fluxmeter
Measures magnetic flux
Galvanometer
Measures electric current
Anemometer
Measures force and velocity of wind and directions
Binoculars
To view distant objects
Kymograph
Graphically records physiological movement. (e.g. blood pressure/heartbeat)
Machmeter
Determines the speed of an aircraft in terms of the speed of sound
Micrometer
Converts sound waves into electrical vibrations
Electrometer
Measures very small but potential difference in electric currents
Sphygmometer
Measures bold pressure
Tangent Galvanometer
Measures the strength of direct current
Teleprinter
Receives and sends typed messages from one place to another
Tonometer
To measure the pitch of a sound
Stethoscope
Used by doctors to hear and analyze heart and lung sounds
Ohmmeter
To measure electrical resistance in ohms
Microscope
To obtain a magnified view of small objects
Nephetometer
Measures the scattering of light by particles suspended in a liquid
Photometer
Compares the luminous intensity of the source of light
Cardiogram (ECG)
Traces movements of the heart, recorded on a Cardiograph
Chronometer
Determines longitude of a vessel at sea.
Cyclotron
A charged particle accelerator which can accelerate charged particles to high energies.
Dyanamo
To convert mechanical energy into electrical energy
Electronecephalograph (EEC)
Records and interprets the electrical waves of the brain (brain waves) recorded on electroence-phalograms
Colorimeter
Compares intensity of colours
Manometer
Measures the pressure of gases
Barograph
Continuous recording of atmospheric pressure
Commutator
To change/reverse the direction of electric current, Also used to convert AC into DC.
Pyrheliometer
Measures components of solar radiation
Tangent
Measures the strength of direct current
Hydrometer
Measures the relative density of liquids
Barometer
Measures atmospheric pressure
Hydrophone
Measures sound under water
Cathetometer
Determines heights, measurement of levels, etc, in scientific experiments
Hypsometer
To determine boiling point of liquids

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