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A seven-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays. Seven-segment displays are widely used in digital clocks , electronic meters, basic calculators, and other electronic devices that display numerical information. Seven-segment representation of figures can be found in patents as early as in U. Patent 1,, , when Carl Kinsley invented a method of telegraphically transmitting letters and numbers and having them printed on tape in a segmented format. In , F. Wood invented an 8-segment display, which displayed the number 4 using a diagonal bar U. Patent ,
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Unprecedented differential pressure measurement accuracy yet a wide range for critical pollutant pathway monitoring, ventilation assessment, filter performance testing, general HVAC measurement and many other applications. GrayWolf AdvancedSense meters include auto-ranging dual DP sensors, as well as auto-zeroing to maintain low-end precision. GrayWolf DP instruments offer broad measurement ranges, yet exceptional sensitivity. They may be utilized for spot checks and for long-term trending of a variety of pressure measurement applications that require high reliability. Differential pressure is a key HVAC measurement parameter in commercial, residential and institutional facilities and in manufacturing plants. For example, measuring pressure drop across coils and filters identifies when cleaning or replacement is in order, leading to improved occupant air quality and to significant energy savings. DP with a pitot tube can measure air velocities in difficult environments e. DP monitoring is also a crucial parameter for determining pollutant pathways for IAQ Indoor Air Quality and for worker exposures, among many other applications. Choose from 2 differential pressure sensors, optionally available for the AdvancedSense or WolfPack. The DPL is more economical, yet has better performance than most other digital manometers on the market.