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The History of Indicators
Many years ago,
indicators
were quite simple, most of them are of the analog type found on
pressure gauges. In the contemporary society , indicators can
range from such simple analog type to colored flat screens that
include switching and control functions.
Analog indicators include all types of
gauges
that use the dial face of a gauge or a vertical bar that is
calibrated to the span of the transmitter analog or process.
