Help needed
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I would like to ask my colleagues: what do the red line and the black line on this pressure gauge respectively mean?
I can’t see the unit indication on the dial; could it be that two measuring instruments are combined together? Like a thermometer and hygrometer combined? ?
These should be two units of measurement, such as pressure in MPA and bar
It should be two measurement values: the outer circle for the long hand, and the inner circle for the short hand.
It’s like a low-temperature differential pressure gauge. .
Isn’t there a ring of red marks and a ring of black marks on the dial? Those correspond to the degrees.