Probes holder with 5 bushes in which there are 3 stainless steel probes for waste water mixture tank units.Plastic bushes 20 mm long, to avoid risk of short circuit due to the humidity inside the tank. A panel with a scale of 3 leds is advising on the almost full tank. Both holders and panels have VDO connections. 2 Version lenght available. 5 Probes model is for clear water.