Durable: Suitable for various water quality environments, long service life. Automatic control, worry-free and labor-saving: After connecting the water level controller, the water level of the water tank can be automatically controlled without manual intervention, which saves worry and effort. Easy installation and easy use: Immersion design, easy installation, plug and play, convenient and fast. Product use: This product is suitable for connecting to the water level controller to automatically control the water volume of the water tank. When the water level is lower than the set low water level, the water pump automatically starts; when the water level reaches the set high water level, the water pump automatically stops, effectively avoiding water waste and equipment idling. Blue line length 1 meter (Responsible for monitoring the high water level, when the water level reaches the blue probe, the water pump stops) Red line length 2 meters (responsible for controlling the start of the water pump, when the water volume is lower than the red line probe, the water pump starts) White line length 3 meters (placed under the water tank) Colour:blue+red+white Material:ABS+Stainless steel Warm reminder: This product is only an immersion stainless steel sensor and does not include a water level controller. Package Contents: 3 * Water level controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.