Product Name:Pressure Gauge For general use, black steel case, plastic rotating window, brass internal and connection. Product Name:stainless steel & ... /4, 1/2, 3/83) Connection threads: npt, bsp (g, pf), bspt (zg, pt)4) Case material: black steel, plastic, chrome plated ... Hg, cmHg or mmHg)7) Accuracy: 3% - 2% - 3% , ±2.5%8)Lip Material: Plastic, plastic dial face, glass dial face9)Bourdon Tube: brass ...