An instrument used for measuring a quantity of something is called a measuring device or a measuring instrument. Examples include a scale for measuring weight, a ruler for measuring length, or a thermometer for measuring temperature.
A scale
Weighing scales
A protractor
A thermometer
micrometer
A clock
Photometer
Weighing scales
It is an instrument for measuring time
The instrument used for measuring pressure is called a manometer.
A measuring instrument is used almost everyday to see the degree or extent of something. When you get your feet measured for new shoes you are using a measuring instrument.