USA SupportUSA BrandUSA StockUSA ServicesDial Size: 1-1/2" Dial Size (Crimped Casing)Accuracy: +/- 4/3/4%Scale: Dual Scale - inHG/BarMovement: Copper AlloyBourdon Tube: Copper AlloyWindow: GlassCase: Steel case for protection in harsh environments (painted black)Connection: Copper Alloy Center Back Mount; 1/8" NPT (for 1-1/2" dial) Normal Ambient Temp.: -4F to +140F (-20C to +60C)