Oscilloscope

If we want see how a
signal is rising and falling we have to use an
oscilloscope.
Oscilloscope is an
excellent device for viewing and measuring electrical
and electronic signals.
An instrument in which the variations in a rising and
falling electrical signal looks like a wave on the
fluorescent screen of a cathode ray tube.
In more simpler terms
it is an instrument for displaying electrical waveforms
on a cathode ray tube
An oscilloscope (abbreviated CRO, for cathode-ray
oscilloscope, or commonly just scope or O-scope).
Oscilloscope is an
instrument used to display a signal graphically. A
multiple trace oscilloscope can show two or more
waveforms for phase comparison and timing measurements
Oscilloscope Manufacturers Links

This is also used for
measurement of time-varying signals. Any time you have
a signal that varies with time slowly or quickly you
can use an oscilloscope to measure it
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