what are the parts of the volt multi meters?

Question

with the descriptions of each parts.

Answer 1

normally they provide a range of measurement for ac or dc voltage,
ohms of resistance and (in series) amps of current

Answer 2

The basic meter or what you could call the "heart" of the meter is the meter movement it's self. Since a "volt" meter really runs on "amps", a typical meter will have a 50 mil or maybe a 100 mil winding to get full scale deflection. The "switched" settings then are just a calibrated series of resistors that act as a voltage divider in shunt with the meter movement. An example would be in using a meter with a 100 mil (amp) movement to read 1 volt at full deflection, the setting switch would have a 10 ohm resistor at that setting. The addition of a battery and it becomes an OHM meter, though, as before, we are reading the amount of current going through the meter and just marking the face in volts and ohms. In the amp mode the same is true and it is just the case of switching in the right amount of very accurate calibrated resistors at the right time to get the correct amount of current through the meter to correlate to the correct scale on the face or dial.

Answer 3

Question is not well defined.
Most multimeters, will give readings less than a volt in millivolts,
these are thousanths of a volt! So 300 mV is three tenths of a volt or 300 /1000 volts

Answer 4

http://en.wikipedia.org/wiki/Multimeter

Can't really answer your question because you're not telling me whether it's an analog or a digital multimeter.