Black steel case 1. Good quality and high accuracy 2. Glass window 3. ... : 1-1/2", 2", 2-1/2", 4", 6" (2)Case: Back steel, plastic (3)Accuracy: 3-2-3%General Pressure Gauge ... : 1-1/2", 2", 2-1/2", 4", 6"(2)Case:stainless steel(3)Window: glass, acrylic.(4)Bounden tube: brass ...