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Visualizations such as gauges can be a useful supplement to standard report representation. But to use gauges in applications efficiently, one needs to accurately adjust visual elements to exact applications subject to used metaphor, visualization, speed of perception and design of the developed application. Anyone who has ever worked with point and numeric multimeters can confirm that numeric meters are more convenient since one doesn't need to wait till the pointer stops, strain their eyes to match pointer reflection on the mirror strip with the pointer itself and to count divisions on the scale. And, of course, to get accurate registration one needs to keep the device right before their eyes (or eyes before the device). Vibration and poor light don't contribute to getting accurate registration.
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