In the E-M spectrum, it is called a frequency meter.
It would depend on what type of frequency you are measuring. One instrument in electric and electronic engineering would be an oscilloscope.
Measuring cylinder
measuring cylinder
You adjust the measuring instrument :)
When are air velocity measurement used
It would depend on what type of frequency you are measuring. One instrument in electric and electronic engineering would be an oscilloscope.
Force meter is the instrument used in measuring force.
Measuring cylinder
A protractor is used for drawing and measuring angles.
Frequency counter
measuring cylinder
Weighing scales
A thermometer
Weighing scales
Photometer
A clock
A protractor