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  2. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    Measuring instruments in fiction: Captain Nemo and Professor Aronnax contemplating thermometers, barometers, clocks, etc. in Jules Verne's 1869-1870 science fiction novel Twenty Thousand Leagues Under the Seas Fun measuring instruments: a Love Meter and strength tester machine at a Framingham, Massachusetts rest stop.

  3. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    10 meters – wavelength of the highest shortwave radio frequency, 30 MHz; 10.2 meters – length of the Panzer VIII Maus, the world's largest tank; 12 meters – height of the Newby-McMahon Building, the world's littlest skyscraper; 23 meters – height of Luxor Obelisk, located in the Place de la Concorde, Paris, France

  4. ANSI C12.20 - Wikipedia

    en.wikipedia.org/wiki/ANSI_C12.20

    ANSI C12.20 is an ANSI standard that describes an American National Standard for Electricity Meters - accuracy and performance. The C12.20 standard established the physical aspects and performance criteria for a meter's accuracy class. It refines certain details in ANSI C12.1 and ANSI C12.10. The existing ANSI accuracy classes for electric ...

  5. Gauge (instrument) - Wikipedia

    en.wikipedia.org/wiki/Gauge_(instrument)

    The two basic types with an analogue display are usually easier for the human eyes and brain to interpret, especially if many instrument meters must be read simultaneously. An indicator or needle indicates the measurement on the gauge. The other two types are only displaying digits, which are more complex for humans to read and interpret.

  6. Micrometer (device) - Wikipedia

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

    Micrometer thimble with a reading of 5.779 ± 0.005 mm. (You must enlarge the image to be able to read the scale to its fullest precision.) The reading consists of exactly 5.5 mm from the main scale plus an estimated 0.279 mm from the secondary scale. Assuming no zero error, this is also the measurement.

  7. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    The visual cortex is the part of the cerebral cortex in the posterior part of the brain responsible for processing visual stimuli, called the occipital lobe. The central 10° of field (approximately the extension of the macula) is represented by at least 60% of the visual cortex. Many of these neurons are believed to be involved directly in ...

  8. SWR meter - Wikipedia

    en.wikipedia.org/wiki/SWR_meter

    An SWR meter does not measure the actual impedance of a load (the resistance and reactance), but only the mismatch ratio. To measure the actual impedance requires an antenna analyzer or other similar RF measuring device. For accurate readings, the SWR meter itself must also match the line's impedance (typically 50 or 75 Ohms).

  9. IEC 62056 - Wikipedia

    en.wikipedia.org/wiki/IEC_62056

    IEC 61107 or currently IEC 62056-21, was an international standard for a computer protocol to read utility meters. It is designed to operate over any media, including the Internet . A meter sends ASCII (in modes A..D) or HDLC (mode E) data to a nearby hand-held unit (HHU) using a serial port .