Pressure gauge Case sizes: 1.5", 2", 2.5", 3.5", 4", 4.5", and 6", 8", 10", Case material: Steel case, steel black case, steel chrome plated case, steel gold Plated case, brass polished case, stainless steel case, all this can Take with front flange, back flange and u-clamp. Bezel material: Steel black bezel, steel bezel, chrome plated bezel, brass bezel, Stainless, steel roll ring (or bayonet threaded ring), type: snap on, roll Ring Tube&socket: Brass, stainless steel, steel with nickel plated, 316 stainless steel, Phosphor bronze and so on. Movement: Brass, stainless steel Connection: 1/8", 1/4", 1/2", 3/8", npt, bsp or bspt dependent on model&size. Bottom, back left&right side connection Available ranges: 30hg "- 0-15-10000psi Windows: Acrylic, glass&polycarbonate lens are available Accuracy: Asme b40.1 grade b(+3-2-3%) Options&accessories: Custom dial, metric scale, din 2.5% accuracy, recalibrators, Restrictors, special connections and more.