Ocean Reef Pressure Gauge BlackSingle Piece Brass Body: Copper Beryllium Coiled Inner Mechanism; Bourdon Tube; Rack And Pinion Movement For Smooth And Precise Operation; Tempered Glass Transparent Window; Plastic Cover With Loops For Fixing: Graduation 350 Bar 5000 Psi, Full Scale. Features Graduation display Clear, easy to read dial design; red zone from 0 to 50 BAR 0 to 600 PSI; increments 10 BAR 100 PSI, all over the scale Dual graduation Fluorescent background will maintain