Winters PCT Series Stainless Steel 304 Dual Scale Contractor Pressure Gauge, 30"Hg Vacuum/kpa, 4-1/2" Dial Display, +/-1% Accuracy, 1/4" NPT Bottom Mount Economical 4-1/2" stainless steel case gauge Case is made of stainless steel 304 Zero adjustment screw CRN registered 5 year warranty