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  2. Rockwell hardness test - Wikipedia

    en.wikipedia.org/wiki/Rockwell_hardness_test

    Benchtop hardness testers can be found either in a digital or analog model. Digital models utilize a digital display whereas the analog models display results on a dial on the machine. Other testers are portable. [citation needed] The determination of the Rockwell hardness of a material involves the application of a minor load followed by a ...

  3. Spirit level - Wikipedia

    en.wikipedia.org/wiki/Spirit_level

    A tubular spirit level A bull's eye spirit level mounted in a camera tripod. A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical . Two basic designs exist: tubular (or linear) and bull's eye (or circular).

  4. Micro Instrumentation and Telemetry Systems - Wikipedia

    en.wikipedia.org/wiki/Micro_Instrumentation_and...

    The steady flow of calculator sales allowed MITS to run full page advertisements in Radio-Electronics, Popular Electronics and Scientific American. In the June 1972 Radio-Electronics, MITS announced a 14 digit calculator (Model 1440) with memory and square root function for $199.95 kit and $249.95 assembled. The original 816 kit was reduced ...

  5. Bull's eye level - Wikipedia

    en.wikipedia.org/wiki/Bull's_eye_level

    A bull's eye level showing a level position A bull's eye level showing an unlevel position Machinist bulls-eye level. A bull's eye level is a type of spirit level that allows for the leveling of planes in two dimensions — both the 'pitch' and 'roll' in nautical terms. Standard tubular levels only consider one dimension.

  6. Smith chart - Wikipedia

    en.wikipedia.org/wiki/Smith_chart

    The Smith chart (sometimes also called Smith diagram, Mizuhashi chart (水橋チャート), Mizuhashi–Smith chart (水橋スミスチャート), [1] [2] [3] Volpert–Smith chart (Диаграмма Вольперта—Смита) [4] [5] or Mizuhashi–Volpert–Smith chart) is a graphical calculator or nomogram designed for electrical and electronics engineers specializing in radio ...

  7. Casio graphic calculators - Wikipedia

    en.wikipedia.org/wiki/Casio_graphic_calculators

    The first model in the series, called the fx-CG100, retains the same power source as its predecessors (4 AAA batteries) instead of Li-ion batteries used by contemporary calculators and also adopts a USB C connector for connecting with a computer (instead of a mini-USB connector) while retaining the 2.5 mm I/O connector for connecting to other ...