Accuracy ± 1.5% of full scale. All pressure sensing parts sealed and dampened by glycerine for long life. Includes safety blow-out disk and pressure equalizing membrane to prevent overpressurization. Copper alloy, coiled safety Bourdon tube for 1000 psi and higher. Dual psi and bar scale readings, 1.5 in gauge face. Enerpac® G2517SL Hydraulic Pressure Gauge, 2.5 in Face, Lower Mount, Glycerine Filled, 6,000 Maximum psi