Major Scientific Instruments and their uses

AccelerometerMeasures acceleration
AltimeterMeasures altitude of an aircraft
AmmeterMeasures electric current in ampere
AnemometerMeasures wind speed
BarometerMeasures atmospheric pressure
BolometerMeasures radiant energy
CaliperMeasures distance
CalorimeterMeasures heat (in chemical reaction)
CrescographMeasures growth in plant
DynamometerMeasures torque
ElectrometerMeasures electric charge
EllipsometerMeasures optical refractive indices
FathometerMeasures depth (in sea)
GravimeterMeasures the local gravitational field of the Earth
GalvanometerMeasures electric current
HydrometerMeasures specific gravity of liquid
HydrophonesMeasures sound wave under water
HygrometerMeasures atmospheric humidity
InclinometerMeasures angel of slope
InterferometerInfrared light spectra
LactometerMeasures purity of milk
MagnetographMeasures magnetic field
ManometerMeasures pressure of gas
OhmmeterMeasures electric resistance
OdometerMeasures distance travelled by a wheeled vehicle
PhotometerMeasures intensity of light
PyrometerMeasures temperature of a surface
RadiometerMeasures intensity or force radiation
RadarDetects distance object, e.g. aircraft, etc.
SextantMeasures angle between two visible objects
SeismometerMeasures motion of the ground (earthquake/seismic waves)
SpectrometerMeasures spectra (light spectrum)
TheodoliteMeasures horizontal and vertical angles
ThermopileMeasures small quantities of radiant heat
ThermometerMeasures temperature
UdometerMeasures amount of rainfall
ViscometerMeasures the viscosity of fluid
VoltmeterMeasures volt
Venturi meterMeasures flow of liquid