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  2. UV marker - Wikipedia

    en.wikipedia.org/wiki/UV_Marker

    An ultraviolet (UV) marker is a pen whose marks are fluorescent but transparent; the marks can be seen only under an ultraviolet light. They are commonly used in security situations to identify belongings or to prevent the reproduction of unauthorized banknotes. UV pens can now be bought at some stationery shops to securely mark items of high ...

  3. Laser pointer - Wikipedia

    en.wikipedia.org/wiki/Laser_pointer

    Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.

  4. Counterfeit banknote detection pen - Wikipedia

    en.wikipedia.org/wiki/Counterfeit_banknote...

    A counterfeit banknote detection pen, used to detect fake banknotes. A counterfeit banknote detection pen is a pen used to apply an iodine-based ink to banknotes in an attempt to determine their authenticity. The ink reacts with starch in wood-based paper to create a black or blue mark but the paper in a real bill contains no starch, so the pen ...

  5. 9 Cheap Seasonal Items at Dollar Tree Only Available in the ...

    www.aol.com/9-cheap-seasonal-items-dollar...

    Dollar Tree has four striped color assortments: gray with black stripes, black with white stripes, white with pink and purple stripes and light gray with blue, white, and dark gray stripes.

  6. Currency detector - Wikipedia

    en.wikipedia.org/wiki/Currency_detector

    A currency detector or currency validator is a device that determines whether notes or coins are genuine or counterfeit.These devices are used in a wide range of automated machines, such as retail kiosks, supermarket self checkout machines, arcade gaming machines, payphones, launderette washing machines, car park ticket machines, automatic fare collection machines, public transport ticket ...

  7. Light pen - Wikipedia

    en.wikipedia.org/wiki/Light_pen

    A light pen detects changes in brightness of nearby screen pixels when scanned by cathode-ray tube electron beam and communicates the timing of this event to the computer. Since a CRT scans the entire screen one pixel at a time, the computer can keep track of the expected time of scanning various locations on screen by the beam and infer the ...

  8. Photoinitiator - Wikipedia

    en.wikipedia.org/wiki/Photoinitiator

    In chemistry, a photoinitiator is a molecule that creates reactive species (free radicals, cations or anions) when exposed to radiation (UV or visible). Synthetic photoinitiators are key components in photopolymers (for example, photo-curable coatings, adhesives and dental restoratives).

  9. 7 Best Fall Items at Dollar Tree That Can Be Reused Next Year

    www.aol.com/7-best-fall-items-dollar-110146172.html

    Harvest Hanging Signs. Price: $1.25 The quickest way to add a touch of fall to your space is by hanging up a Harvest Hanging Sign.. For $1.25 each, shoppers can choose from four signs with ...

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