Profile: Derex Inc offers ultrasonic flow meters, which is clamped to the outside of the pipe. Our Doppler flow meters are for liquids with suspended solids or entrained gases. We offer nugent oil filters that have a high dirt holding capacity with nominal particle size retention. We provide record filtering of lube oil, fuel oil, crude oil and solvents. Our CoronaArc igniter has a protruding fuel grabbing electrode that delivers a powerful, non-fouling, contaminant burning spark. We deal with heavy duty industrial grade cameras, which allow viewing kiln, burner, or process on a monitor in the control room, or a computer on a desk.