Give comparison of Bourdon tube and Diaphragm.
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Bourdon tube
Diaphragm.
Gear drive connects dial reading
No gears inside the diaphragm pressure gauge
Increased gap between gear and arm affect accuracy 
Shock resistant and good accuracy
Not sudden pressure endurable
sudden pressure endurable
Need to fill glycerin/oil to gauge
No need to fill glycerin/oil to gauge
It takes more time to measure pressure and Expensive
Users save time and money
Large range of pressure measurement
Small range of pressure measurement
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