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  2. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders .

  3. File:NREL PV Cell Record Efficiency Chart.png - Wikipedia

    en.wikipedia.org/wiki/File:NREL_PV_Cell_Record...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

  4. Optical power meter - Wikipedia

    en.wikipedia.org/wiki/Optical_power_meter

    An optical power meter (OPM) is a device used to measure the power in an optical signal. The term usually refers to a device for testing average power in fiber optic systems. Other general purpose light power measuring devices are usually called radiometers , photometers , laser power meters (can be photodiode sensors or thermopile laser ...

  5. dBm - Wikipedia

    en.wikipedia.org/wiki/DBm

    Power level Power Notes 526 dBm: 3.6 × 10 49 W: Black hole collision, the power radiated in gravitational waves following the collision GW150914, estimated at 50 times the power output of all the stars in the observable universe. [7] [8] 420 dBm: 1 × 10 39 W: Cygnus A, one of the most powerful radio sources in the sky 296 dBm: 3.846 × 10 26 W

  6. Microwave power meter - Wikipedia

    en.wikipedia.org/wiki/Microwave_power_meter

    A microwave power meter is an instrument which measures the electrical power at microwave frequencies typically in the range 100 MHz to 40 GHz. Usually a microwave power meter will consist of a measuring head which contains the actual power sensing element, connected via a cable to the meter proper, which displays the power reading.

  7. Through-the-lens metering - Wikipedia

    en.wikipedia.org/wiki/Through-the-lens_metering

    There were a few particularly sophisticated film SLRs including the Olympus OM-2, the Pentax LX, the Nikon F3, and the Minolta 9000, where metering cells located at the bottom of the mirror box were used for ambient light metering, depending on model either instead or in addition to metering cells in the roof of the camera. Depending on model ...

  8. United States Marine Corps Physical Fitness Test - Wikipedia

    en.wikipedia.org/wiki/United_States_Marine_Corps...

    Number of crunches depends on age for a perfect score of 100 points for this event A Marine recruit performs pull-ups A perfect score is achieved by completing the three-mile run in less than 18 minutes. The United States Marine Corps requires that all Marines perform a Physical Fitness Test (PFT) and a Combat Fitness Test (CFT) once each ...

  9. Level sensor - Wikipedia

    en.wikipedia.org/wiki/Level_sensor

    Pneumatic level sensors are used where hazardous conditions exist, where there is no electric power or its use is restricted, or in applications involving heavy sludge or slurry. As the compression of a column of air against a diaphragm is used to actuate a switch, no process liquid contacts the sensor's moving parts. These sensors are suitable ...