This appears to be a dual-gauge brass gas pressure regulator designed for MIG and TIG welding using CO2 or argon gas.Key FeaturesLeft Gauge: Measures the output flow rate in liters per minute (L/min) for shielding gas, usually up to 30 L/min.Right Gauge: Measures the high pressure remaining inside the gas cylinder in bar and psi.Brass Body: Provides a durable, corrosion-resistant metallic build rated for industrial welding standards like EN 562.Adjustment Knob: Located at the center-bottom to manually regulate and control the gas flow output.