Define electronic measuring tools.

What is digital multimeter (DMM)?

A multimeter or a multimeter, also known as a VOM (volt-ohm-millimeter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter can measure voltage, current, and resistance. Analog multimeter uses a micrometer with a moving pointer to display readings.
What is an oscilloscope?

An oscilloscope is a laboratory instrument commonly used to display and analyze the waveform of electronic signals. In effect, the device draws a graph of the instantaneous signal voltage as a function of time.
Uses of an oscilloscope :

Oscilloscopes are used to observe the change of an electrical signal over time, such that voltage and time describe a shape that is continuously graphed against a calibrated scale. The observed waveform can be analyzed for such properties as amplitude, frequency, rise time, time interval, distortion, and others.