# Online Encyclopedia

# Measuring instrument

In physics and engineering, measurement is the activity of comparing physical quantities of real-world objects and events. Established standard objects and events are used as units, and the measurement results in a given number for the relationship between the item under study and the referenced unit of measurement. **Measuring instruments** are the means by which this translation is made.

Physicists use a vast range of instruments to perform their measurements. These range from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators.

History of Weights and Measures

Timeline of time measurement technology

- altimeter
- interferometer
- micrometer
- odometer
- opisometer
- ruler
- tape measure
- laser range-finder
- ultrasound distance measure

- planimeter

- Barometer
- Manometer
- Pitot tube (used to determine speed)
- anemometer (used to determine wind speed)
- tire-pressure gauge

Timeline of temperature and pressure measurement technology

Electrical Properties

- electrometer (Measures charge)
- Ammeter (Measures electrical current)
- Galvanometer (Measures current)
- Ohmeter (Measures resistance)
- Voltmeter (Measures voltage)
- Wheatstone bridge
- multimeter (Measures all of the above)
- Oscilloscope
- Watt meter (measures power)
- electric energy meter (Measures energy)

*uncategorized*

- Spectroscopy is an important tool used by physicists.
- Microscope
- Spectrometer
- geiger counter
- Nichols radiometer
- radiometry

Last updated: 10-24-2004 05:10:45