The Model 06-5 and 06-6SP Sensors are a solid-state sending unit and a self-grounding stainless-steel probe. The 06-5 is designed specifically to detect water in diesel fuel and gasoline. The electronic enclosure has two LED lights: the green light indicates the sensor has power and is ready to work; the red light comes on and stays on when water is detected. Also available, the Model FWS-HH portable water detector is a handheld unit that can be used in conjunction with the tank dipping process. When attached to the dipping rod no paste is needed.