Pmmc meter are most accurate instrument for DC measurement however they are unable to measure the AC quantity. The working principle is as follows: a moving coil is free to move in a external static magnetic field. And the pointer moves according to the interaction of two fields, field of static mag. and that of measuring quantity. Now in case of it is impossible to produce a sustained magnetic field, that's why we can not use PMMC to measure the ac.
The barometer is the instrument that is used to measure the air pressure.
This instrument is an adequate type of balance.
One instrument used to measure roughness of roads is the response type road roughness meters (RTRRMs)
A durometer is an instrument that is used to measure hardness. Specifically, a durometer can be used to measure a material's resistance to indentation.
A hygrometer is used to measure water vapor in the atmosphere. This instrument can measure humidity levels in the air to determine the amount of water vapor present.
Permanent magnet moving coil instruments are used for measuring d.c. quantities only. This is so because for these instruments the torque is proportional to the operating quantity either voltage or current.
Because in the coil DC current follow easly and pmmc meter is making with coil and AC current is not follow in coil so we used the pmmc only fpr DC current.
No. The instrument used to measure wind speed is an anemometer.
The instrument which is used to measure snowfall is called a snow gauge.
A thermometer
yes
There is no single instrument for either of these things
The instrument used to measure humidity is called a hygrometer.
The instrument used to measure humidity is called a hygrometer.
A protractor is used to measure an angle.
A protractor can be used to measure an angle.
This instrument is a balance.