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  2. Micrometer (device) - Wikipedia

    en.wikipedia.org/wiki/Micrometer_(device)

    A micrometer, sometimes known as a micrometer screw gauge (MSG), is a device incorporating a calibrated screw widely used for accurate measurement of components [1] in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers.

  3. Hegman gauge - Wikipedia

    en.wikipedia.org/wiki/Hegman_gauge

    The grooves decrease in depth from one end of the block to the other, according to a scale stamped next to them. A typical Hegman gauge is 170mm by 65mm by 15mm, with a channel of grooves running lengthwise, 12.5mm across and narrowing uniformly in depth from 100 μm to zero and used to determine particle size. [3]

  4. Permanent downhole gauge - Wikipedia

    en.wikipedia.org/wiki/Permanent_Downhole_Gauge

    A permanent downhole gauge (PDG) is a pressure and/or temperature gauge permanently installed in an oil or gas well. [1] These gauges are typically installed in the tubing in the well and can measure the tubing pressure, annulus pressure, or both.

  5. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    The widely used Bourdon gauge is a mechanical device, which both measures and indicates and is probably the best known type of gauge. A vacuum gauge is used to measure pressures lower than the ambient atmospheric pressure, which is set as the zero point, in negative values (for instance, −1 bar or −760 mmHg equals total vacuum). Most gauges ...

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  7. Category:Vacuum gauges - Wikipedia

    en.wikipedia.org/wiki/Category:Vacuum_gauges

    Pirani gauge; R. Residual gas analyzer This page was last edited on 2 December 2019, at 04:47 (UTC). Text is available under the Creative Commons Attribution ...

  8. The best air purifiers of 2025 - AOL

    www.aol.com/lifestyle/best-air-purifiers...

    Integrated sensors gauge air quality, prompting the unit to adjust the fan as needed (in Auto mode), plus there’s a quieter and energy-friendly Slee mode, a timer button, and LED light that ...

  9. The 4 Worst Drinks If You’re Trying to Lose Visceral Fat ...

    www.aol.com/lifestyle/4-worst-drinks-youre...

    Visceral fat is the type of fat that surrounds your internal organs in your abdomen. It can be particularly worrisome because it's housed in places where fat shouldn’t be stored in excess. While ...

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