Optic sensor(overfill detection system for tank truck,socket,probe) Optic sensor( ... square meters. Main products are: concrete mixer truck, fuel truck, chemical liquid truck, bulk cement truck, truck ... tractor head truck, tractor truck,towing vehicle,fuel tank,fuel tank truck,fuel truck,oil truck,oil tank truck,liquid ... Valves etc. Optic sensor(overfill detection system for tank truck,socket,probe)