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2. Light meter - Wikipedia

   en.wikipedia.org/wiki/Light_meter

   Use of a light meter for portrait cinematography in a Turkish music video set. A light meter (or illuminometer) is a device used to measure the amount of light.In photography, an exposure meter is a light meter coupled to either a digital or analog calculator which displays the correct shutter speed and f-number for optimum exposure, given a certain lighting situation and film speed.

3. Optical power meter - Wikipedia

   en.wikipedia.org/wiki/Optical_power_meter

   GR-198, Generic Requirements for Hand-Held Stabilized Light Sources, Optical Power Meters, Reflectance Meters, and Optical Loss Test Sets, discusses OLTS equipment in depth. Alternatively, an Optical Time Domain Reflectometer (OTDR) can measure optical link loss if its markers are set at the terminus points for which the fiber loss is desired ...

4. Digital handheld refractometer - Wikipedia

   en.wikipedia.org/wiki/Digital_handheld_refractometer

   The difference is that light from an LED light source is focused on the underside or a prism element. When a liquid sample is applied to the measuring surface of the prism, some of the light is transmitted through the solution and lost, while the remaining light is reflected onto a linear array of photodiodes creating a shadow line.

5. Refractometer - Wikipedia

   en.wikipedia.org/wiki/Refractometer

   Hand-held refractometer. A refractometer is a laboratory or field device for the measurement of an index of refraction (refractometry).The index of refraction is calculated from the observed refraction angle using Snell's law.

6. Through-the-lens metering - Wikipedia

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

   In photography, through-the-lens metering (TTL metering) refers to a feature of cameras whereby the intensity of light reflected from the scene is measured through the lens; as opposed to using a separate metering window or external hand-held light meter. In some cameras various TTL metering modes can be selected.

7. The best air purifiers of 2025 - AOL

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

   We put the best air purifiers from Lenovo, Honeywell, Winix, and more to the test to see which held up best (and actually purified the air for you). See what our product scientist has to say.

8. These Are the Best Handheld Spotlights for Your Emergency ...

   www.aol.com/lifestyle/8-best-handheld-spotlights...

   Light your path with bright handheld LED spotlights for emergencies, boating, camping, and beyond.

9. Selenium meter - Wikipedia

   en.wikipedia.org/wiki/Selenium_meter

   A selenium meter is a light-measuring instrument based on the photoelectric properties of selenium. The most common use of such light meters is measuring the exposure value for photography. The electric part of such a meter is an electromagnetic measuring instrument which is connected to the anode and cathode of a selenium photo cell that ...