Panel Mount Vacuum Gauge, U Clamp, Dial Size 2 1/2 In, Range 30 to 0 In Hg Vac, Connection Size 1/8 In NPT, Connection Location Back, Smallest Graduation 1 In Hg, Accuracy Plus or Minus3-2-3 %, Steel Case Material, Black Case Color, Brass Socket Material, Bronze Tube Material, Polycarbonate Lens Material, Operating Temp Range -40 to 120 F