Spring and diaphragm as well as magnet couple with pointer.
Differential pressure indicated on dial due to AP pressure of high side and low side be made from magnet couple with pointer.
Technical Data
Housing Material: 316 stainless Steel
Pressure Elément: Diaphragm-NBR; other parts all in SS316
Process Connection: WNPT female; and Large connection with adaptor available
(Both of High & Low side must be pressured on line at the same time.)