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2. Radio-frequency identification - Wikipedia

   en.wikipedia.org/wiki/Radio-frequency_identification

   A Passive Reader Active Tag (PRAT) system has a passive reader which only receives radio signals from active tags (battery operated, transmit only). The reception range of a PRAT system reader can be adjusted from 1–2,000 feet (0–600 m), allowing flexibility in applications such as asset protection and supervision.

3. List of humorous units of measurement - Wikipedia

   en.wikipedia.org/wiki/List_of_humorous_units_of...

   Parsecs are used in astronomy to measure interstellar distances. A parsec is approximately 3.26 light-years or about 3.086×10 16 m (1.917×10 13 mi). Combining it with the "atto-" prefix (×10 −18) yields attoparsec (apc), a conveniently human-scaled unit of about 3.086 centimetres (1.215 in) that is used only humorously. [7]

4. Factor of safety - Wikipedia

   en.wikipedia.org/wiki/Factor_of_safety

   In engineering, a factor of safety (FoS) or safety factor (SF) expresses how much stronger a system is than it needs to be for an intended load.Safety factors are often calculated using detailed analysis because comprehensive testing is impractical on many projects, such as bridges and buildings, but the structure's ability to carry a load must be determined to a reasonable accuracy.

5. Distance measuring equipment - Wikipedia

   en.wikipedia.org/wiki/Distance_measuring_equipment

   D-VOR/DME ground station DME antenna beside the DME transponder shelter. In aviation, distance measuring equipment (DME) is a radio navigation technology that measures the slant range (distance) between an aircraft and a ground station by timing the propagation delay of radio signals in the frequency band between 960 and 1215 megahertz (MHz).

6. Ring size - Wikipedia

   en.wikipedia.org/wiki/Ring_size

   Ring size is a measurement used to denote the circumference (or sometimes the diameter) of jewellery rings and smart rings. Measuring tools ... M: 12: 12.5 0.666:

7. Micrometer (device) - Wikipedia

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

   Animation of a micrometer in use. The object being measured is in black. The measurement is 4.140 ± 0.005 mm. Micrometers use the screw to transform small distances [9] (that are too small to measure directly) into large rotations of the screw that are big enough to read from a scale. The accuracy of a micrometer derives from the accuracy of ...