What is Differential pressure transmitter?How to measure DP b/w any two points using transmitter?

Differential pressure Transmitter PART - 1
What is Differential pressure transmitter?How to measure DP b/w any two points using transmitter?
#What instruments can be used to measure the DP of any tow points in any line, vessel or tank?
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#measuring dp with differential pressure gauge
#measuring differential pressure with transmitters