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The process of measurement involves estimating the ratio of the magnitude of a quantity to the magnitude of a unit of the same type (length, time, mass, etc.). A measurement is the result of such a process, expressed as the product of a real number and a unit, where the real number is the estimated ratio. An example is 9 metres, which is an estimate of an object's length relative to a unit of length, the metre. Unlike a count, or integer quantity of items that is known exactly, every measurement is an estimate that has some uncertainty.

A measurement is a comparison to a standard. -- William Shockley

By number we understand not so much a multitude of Unities, as the abstracted Ratio of any Quantity to another Quantity of the same kind, which we take for Unity. -- Sir Isaac Newton (1728)

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Airometrix Mfg. Inc. - Manufactures flow meters for testing and monitoring leaks in air compressor equipment and systems. Site discusses likelihood of air leaks and benefits of early detection and elimination.
Meta Description: [ Home Page of Airometrix Mfg., Inc. web site. Provide training, consulting, testing, and auditing services in support of our representatives and instrument purchasers. ]

ATEQ Corporation - Manufactures and supplies leak testing equipment for wide range of industrial, commercial, building construction, and medical applications. Units can include measurement of flow, volume, pressure, and electrical factors.
Meta Description: [ Worldwide leader in pressure decay leak testing. Specialist in leak testing, testing to electrical safety standards and automatic quality control. ]

Helium Leak Testing - Helium leak testing, vacuum gauge leak standard calibration detector, and vacuum pump sales and service.
Meta Description: [ Helium leak testing, calibration, and vacuum pump services are our three general areas of expertise. ]

I Solutions Limited - A UK manufacturer of flow and leak measurement instrumentation for production line quality control and data recording and reporting systems for process and environmental monitoring.
Meta Description: [ C&I Solutions specialise in leak detection, leak testers, flow meters, pressure transducers, flow measurement, pressure testing, pressure calibration, datalogging, emissions reporting. ]

Ionics Agar Environmental Ltd. - Specializes in equipment for detecting oil leaks in various collections of water. Site explains and includes animated demonstration of underlying technical principle, as well as discussing the wide range of possible applications.
Meta Description: [ GE Analytical Instruments offers Leakwise Oil on Water Monitors for early detection of oil leaks and water pollution ]

500 Poulson Vacuum Services - Fully automated Helium based gross and fine leak test systems.

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500 The Test Faster Company - Manufactures multi-channel leak testers and leak testing systems. Computer-based flow and leak testers are used to test products manufactured in the medical device, personal care products, automotive, aerospace, and home appliance industries.
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Uson Inc. - Specialists in leak detection, leak testers, leak detection systems, package integrity testing and flow measurement
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