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Related Concept Videos

Measurement: Standard Units03:38

Measurement: Standard Units

Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
Measurement: Derived Units03:02

Measurement: Derived Units

The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length, mass, time, temperature, electric current, amount of substance, and luminosity. These are called the SI base units.
International System of Units01:29

International System of Units

The International System of Units, known as the SI system, is a universally accepted measurement system recognized and used worldwide. The SI system is based on a set of three base units considered absolute, and their values do not change with location. These base units are meters, kilograms, and seconds.
Prefixes are used to define both larger and smaller quantities in the SI system. For example, milli, micro, and nano define smaller quantities, while kilo, mega, and giga are used to define...
Units of Measurement01:27

Units of Measurement

Mechanical engineering is one of the oldest branches of engineering. It deals with designing, analyzing, and manufacturing machines and mechanical systems. To ensure precise and accurate calculations, units of measurement are used. They provide a standard system for expressing and comparing physical quantities.
There are various well-known historical measurement systems, such as the Babylonian system, the Roman system, the Egyptian system, the Olympian system, the British system, and the Indus...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
Units and Standards of Measurement01:10

Units and Standards of Measurement

A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...

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Related Experiment Video

Updated: Jun 26, 2026

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
06:43

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band

Published on: May 2, 2018

BRAVO wireless 48 hour pH-metric system.

Tomas Hess1, Eckhart G Hahn, Peter C Konturek

  • 11st Department of Medicine, University Erlangen-Nuremberg, Erlangen, Germany.

Medical Science Monitor : International Medical Journal of Experimental and Clinical Research
|December 31, 2008
PubMed
Summary

The BRAVO system offers a wireless method for monitoring esophageal pH exposure, aiding in gastro-esophageal reflux disease (GERD) diagnosis. This review covers its placement, safety, data quality, and future uses.

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Last Updated: Jun 26, 2026

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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Published on: April 18, 2019

Area of Science:

  • Gastroenterology
  • Medical Devices
  • Diagnostic Technology

Background:

  • Esophageal pH monitoring is crucial for diagnosing gastro-esophageal reflux disease (GERD).
  • Traditional methods can be invasive and uncomfortable for patients.
  • The BRAVO system represents a novel wireless approach to intraesophageal pH measurement.

Purpose of the Study:

  • To provide a comprehensive overview of the BRAVO system for intraesophageal pH monitoring.
  • To review the safety, reliability, and patient comfort associated with the BRAVO system.
  • To discuss various aspects including capsule placement, complications, data quality, and future applications.

Main Methods:

  • Review of published studies on the BRAVO system.
  • Analysis of data regarding capsule placement techniques.
  • Evaluation of reported complications and data quality metrics.

Main Results:

  • The BRAVO system is a wireless capsule clipped to the esophageal mucosa for pH data collection.
  • Studies have assessed its safety, reliability, and patient comfort since its clinical introduction.
  • Various methods of capsule placement and associated complications have been documented.

Conclusions:

  • The BRAVO system offers a valuable wireless alternative for esophageal pH monitoring in GERD diagnosis.
  • Further research and application are expected to refine its use and expand its clinical utility.
  • Understanding placement methods and potential complications is key to optimizing BRAVO system performance.