... ), 2"(50mm), 2.5“(63mm), 4”(100mm) and 6“ (150mm)Case Black steel, ABS or chrome platedPressure range0 -250Mpa,other scale units ... bar, psi, kg/cm2 etc.optionalRingNon, black steel or chrome platedMovementBrassSocketBrassBourdon tubePhosphor BronzeDial plate and pointerAluminumWindowGlass or ... PlasticConnection sizes1/8 for 1.5" case; 1/4 for 2",2.5" case, 3/8"&1/2" for 4",6 ...