**Measurement**is the process of quantifying the physical world with a number. This is performed with a variety of tools, sensors, systems and calculations that measure different aspects of things. Each measurement is captured using standard units such as those provided by the metric system, United States customary units or the Imperial system. The following are common examples of measurements.

Tool | Measurement | Standard Units |

Clock | Time | Second, Minutes, Hours |

Ruler | Length, Width, Height | Inches, Feet, Centimeters, Meters |

Angle Ruler / Protractor | Angle | Degrees (°) |

Scale | Weight / Mass | Pounds / Kilograms |

Measuring Cup / Beaker Glass | Volume | Ounces / Quarts / Gallons / Milliliters/ Liters |

Thermometer | Temperature | °F / °C |

Odometer | Distance Traveled | Miles / Kilometers |

Speedometer | Speed / Velocity | Miles per hour (mph), Kilometers per hour (km/h) |

Global Positioning System | Location on surface of the planet | Latitude and Longitude |

Ammeter | Electrical Current | Amperes |

Voltmeter | Electric Potential | Volts |

Barometer | Atmospheric Pressure | Atmospheres / Bars |

Hygrometers | Humidity | Relative Humidity (%) |

Anemometers | Wind Speed and Direction | Feet Per Minute / Meters Per Second |

Sound Level Meter | Sound Levels | Decibels (dB) |

Theodolite | Angles Between Two Points (e.g. surveying) | Radians (rad) / Degrees (°) / Seconds of Arc (arcsec) |

Level | Level Surface, Plumb Surface | Degrees (°) |

Operating Systems | File Size / Data Size | Bytes |

Electrical Meter | Electricity Consumption | Kilowatt Hours (kWh) |

Calorimeter | Heat Output of a Fuel (e.g. the energy in food) | Calories / Small Calories / Kilogram Calories |

Seismograph / Seismometer | Ground motion (i.e. earthquakes) | Magnitude |

Pressure Meters / Pressure Gauges / Manometers | Pressure of a Liquid or Gas | Pounds Per Square Inch (psi), Megapascal (MPa) |

pH Meter | Acidity / Alkalinity | pH |

Altimeter | Altitude | Feet / Meters |

Depth Finder | Depth of Water | Feet / Meters |