Compound Pressure Gauge
Diameter: 2", 2-1/2", 3", 4", 5", 6"
Case: plastic, stainless steel
Window: polycarbonate, glass 
Internal: brass,stainless steel
Connection: bottom connection, center back male connection
Accuracy: 2.5%, 1.6%, 1% 
Scale: psi, bar, Mpa, Kpa, kg/cm2, Hg single or dual scale or according to customers order.
Inlet thread: 1/8", 1/4", 1/2", 3/8", NPT ,BSPT, BSP