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.

Blood Pressure

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  measuring instrument for blood pressure
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  measuring instrument for blood pressure

Chemistry

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  photoionisations detector - proves contamination thru gases
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  ion mobility spectrometer - proves contamination thru industry and weapon gases in the air

Engineering

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  feeler gauge
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  sine bar
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  Vernier & electronic height gauge
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  Vernier height gauge adjusters
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  Vernier height gauge, close up view
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  Electronic height gauge, close up view
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  Messschieber
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  Micrometer sleeve reading 5.78mm
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  Micrometer thimble reading 0.276 inch
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  Micrometer sleeve (with vernier) reading 5.783mm

Flow

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  Variable area flowmeter
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  Floater type flowmeter
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  Turbine flowmeter
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  Reduced orifice variable area flowmeter
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  Venturi tube
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  Orifice metering flange
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  Mass flow meter
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  Mass flow meter
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  Rotameter

Frequency

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  Power supply frequency meter

General

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  hairline gauge

Metrics

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  rulers
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  pocket tape measure
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  doble meter
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  textil meter
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  setsquare
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  triangle, set square

Radiation

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  Victoreen Geiger counter
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  Modern Geiger counter
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  Using a geiger counter to measure radioactive emissions from a sample of Sodium 22.
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  Geiger counter measuring tree at Chernobyl

River-level

See Stream gauge

Traffic

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  traffic jam detector