Dial Size: 2-1/2";Fill: Glycerine;Gauge Type: Liquid Vacuum;Mount Size: 1/4";Mount Type: CBM;Case Material: 304 Stainless Steel;Dial Range: PSI 30-0Hg;Accuracy: +/- 1.5% Full Scale Value;Temperature Range: -4F to 140F (-20C to 60C);Connection: Material Brass;Increments: 0.50 PSI