Pressure Gauge, Pressure, 2-1/2 In., 30 In. Hg Vac to 0, Connection Size 1/4 In. FNPT, Connection Location Bottom, Smallest Graduation 0.5 In. Hg, Graduations 5 In. hg, Accuracy 1.6 Percent, Case Material 304 Stainless Steel, Case Color Silver, Socket Material 316 Stainless Steel, Tube Material 316 Stainless Steel, Filled With Glycerin, Lens Material Plastic, Ring Material Polished Stainless Steel, Operating Temp. Range -30 Degrees to 200 Degrees F, Characteristics Heavy Duty