' Vacuum Gauge, Process, 4-1/2 In., 30 In. Hg Vac to 0, Connection Size 1/2 In. NPT, Connection Location Lower, Smallest Graduation 1 In. Hg, Accuracy +/-0.5 Percent, Case Material Phenolic, Case Color Black, Socket Material Brass, Tube Material Phosphor Bronze, Lens Material Glass, Ring Material Threaded Polypropylene, Operating Temp. Range -50 Degrees to 150 Degrees F, For Use With Media Compatible with Bronze, Series 1279AS '