SPECIFICATIONS: Size: 1.5", 2", 2.5", 4" Pressure Range: 0-7, 0-10, 0-12, 0-16 bar Connection: Brass; 1/8, 1/4 PT or NPT, G1/4, BSPT 1/4 Bourdon Tube: Phosphor Bronze Movement: Brass, Stainless steel Case: ABS, Painted Steel Window (Lens): Glass, Acrylic, Polycarbonate plastic, Polystyrene plastic Pointer and Dial: Aluminum Accuracy: 3-2-3%, 1.6%, 2.5% Ambient Temperature: 66°C (150°F) max