Measuring instruments are used to determine characteristics or values using specific procedures and/or methods make a reference measurement. These instruments are designed to provide accurate and reliable measurements of physical, chemical, or electrical properties. Some common examples of measuring instruments include:

- Rulers measure length

- Thermometers measure temperature

- Scales measure weight

- Voltmeters measure voltage

- Ammeters measure current

- pH meters measure acidity or alkalinity

- Spectrophotometers measure the intensity of light absorbed by a substance

- Gas chromatographs measure the composition of a gas mixture

- Microscopes magnify images of small objects

- Telescopes magnify images of distant objects

Measuring instruments are used in a wide variety of applications, from scientific research to industrial quality control. They are essential for ensuring the accuracy and reliability of measurements, and for making informed decisions based on the data they provide.