An analog meter is a measuring instrument that uses a physical pointer or needle to indicate the value being measured on a graduated scale.  Compared to digital meters, which display readings electronically on a screen, analog meters provide a continuous and  analog  representation of the measurement.
Here are some key characteristics of analog meters:
Display:  As mentioned earlier, the measurement is shown by a pointer or needle moving across a scale with markings.  The markings correspond to the range of values the meter can measure.
Movement Types: There are two main types of movements used in analog meters:
Moving Coil Movement: This type uses a coil of wire that rotates within a magnetic field when current flows through it. The deflection of the coil is proportional to the current, and a pointer attached to the coil moves across the scale.
Moving Iron Movement: This type uses a piece of soft iron that is attracted to a magnetic field. The strength of the magnetic field determines the position of the iron piece, and consequently the pointer.
Applications: While digital meters have become more common, analog meters are still used in some situations. Here are some examples:
Retro style instruments: Some people appreciate the classic look of analog meters, especially in vintage audio equipment or for aesthetics.
Monitoring applications: For certain applications, the continuous analog display can be easier to monitor for subtle changes compared to a digital readout that updates periodically.
Educational purposes: Analog meters can be helpful for understanding the basic principles of electrical measurements.
Advantages of Analog Meters:
Ease of use: The analog display can be easy to interpret for someone familiar with the scale.
Quick reference: You can get a general idea of the measurement at a glance without needing to read a specific numerical value.
Cost-effective: Analog meters can be simpler and less expensive to manufacture compared to some digital meters.
Disadvantages of Analog Meters:
Lower accuracy: Generally, analog meters offer less precise readings compared to digital meters.
Limited resolution: The markings on the scale may not provide very fine-grained readings.
Parallax error: The angle at which you view the meter can slightly affect the reading.
Overall, analog meters have served as the workhorse for electrical measurements for many years. While digital meters offer greater accuracy and versatility, analog meters can still be valuable tools in specific situations or for those who appreciate their classic look and ease of interpretation.