JB Industries M2-460 Standard Manifold Gauges, 2-1/2" Refrigerants: R-22, R-404A, R-410A - Blue, low side gauge Compound steel case - Available with brass or chrome cases 30" vacuum to 250 psi, retard 500 psi - High impact clear Lexan lens Recalibration screw - Full size brass movements 1/8" MPT connections - Made in the USA