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  2. List of vehicle instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_vehicle_instruments

    Download as PDF; Printable version; ... often found on its control panel or dashboard. Types ... Turn light; Engine service indicator; Seat belt indicator;

  3. Stack light - Wikipedia

    en.wikipedia.org/wiki/Stack_light

    Stack light in automated production for in-line quality inspection. Stack lights (also known as signal tower lights, indicator lights, andon lights, warning lights, industrial signal lights, or tower lights) are commonly used on equipment in industrial manufacturing and process control environments to provide visual and audible indicators of a machine's status to machine operators, technicians ...

  4. Fuel gauge - Wikipedia

    en.wikipedia.org/wiki/Fuel_gauge

    In addition, when the resistance is at a certain point, it will also turn on a "low fuel" light on some vehicles. [3] Meanwhile, the indicator unit (usually mounted on the dashboard) is measuring and displaying the amount of electric current flowing through the sending unit. When the tank level is high and maximum current is flowing, the needle ...

  5. Tell-tale (automotive) - Wikipedia

    en.wikipedia.org/wiki/Tell-tale_(automotive)

    A group of tell-tales showing lights for "brake fluid", "stop lamp" and "check engine" Graphical tell-talesA tell-tale, sometimes called an idiot light [1] or warning light, is an indicator of malfunction or operation of a system, indicated by a binary (on/off) illuminated light, symbol or text legend.

  6. Redox indicator - Wikipedia

    en.wikipedia.org/wiki/Redox_indicator

    A redox indicator (also called an oxidation-reduction indicator) is an indicator which undergoes a definite color change at a specific electrode potential. The requirement for fast and reversible color change means that the oxidation-reduction equilibrium for an indicator redox system needs to be established very quickly. Therefore, only a few ...

  7. Electroluminescence - Wikipedia

    en.wikipedia.org/wiki/Electroluminescence

    Views of a liquid crystal display, both with electroluminescent backlight switched on (top) and switched off (bottom). Electroluminescence (EL) is an optical and electrical phenomenon, in which a material emits light in response to the passage of an electric current or to a strong electric field.

  8. Complexometric indicator - Wikipedia

    en.wikipedia.org/wiki/Complexometric_indicator

    A complexometric indicator is an ionochromic dye that undergoes a definite color change in presence of specific metal ions. [1] It forms a weak complex with the ions present in the solution, which has a significantly different color from the form existing outside the complex. Complexometric indicators are also known as pM indicators. [2]

  9. Methyl red - Wikipedia

    en.wikipedia.org/wiki/Methyl_red

    Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid), also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pK a of 5.1. [2]