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Proximity sensors detect objects without coming into contact with them by emitting a high-intensity infrared beam. Some proximity sensors detect reflected light from an object, while others use two infrared beams and rep... More »

www.reference.com Technology Mobile

A light microscope uses a focused beam of visible light to magnify objects for observation. It works in a similar way as a refracting telescope but with several minor differences. A telescope uses a large objective lens,... More »

www.reference.com Science Chemistry Chem Lab

Legacy propane infrared plaque heaters work by using a ceramic plaque that emits infrared radiation to heat people and objects directly in the path of the beam. Combustion of the propane in the heater heats the plaque to... More »

www.reference.com Home & Garden Heating & Cooling
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Comfort Zone infrared space heaters work by emitting infrared radiation that heats up persons and objects directly in the path of the infrared beam. Some Comfort Zone infrared heaters also warm up air with infrared emitt... More »

www.reference.com Home & Garden Heating & Cooling

The tendency of the brain to group objects, known as the principle of proximity, is achieved by placing shapes, forms or other elements close to one another in a work of art, so that the objects are perceived as a unifie... More »

www.reference.com Art & Literature Fine Art

The Microsoft Pro Pen stylus works with the Wacom digitizer in Surface Pro and Surface Pro 2 tablets and offers palm blocking sensors and pressure sensitivity. Its pen tip, eraser tip and pen button can work as a traditi... More »

www.reference.com Technology Mobile

Some features of HTC phones include all-metal design, dual front-facing stereo speakers, front and back cameras, 5.0 inch display, Bluetooth and Wi-Fi connectivity, and sensors. Although some older models might not have ... More »

www.reference.com Technology Mobile