... function, it is widely used in the fields of electric power, pressure vessels, railway, space & aviation, shipbuilding, metallurgy etc. as an ... negativeRejection0~80%Pulse Shifting Range0~4800mm(Longitudinal wave in steel )Power SupplyMain Machine: DC 12V; Charger: AC220V±22V, 50Hz±1HzSensitivity Surplus≥60dBFar ...