Features ???? ACCURATE CONTROL: The internal contacts of the stainless steel level sensor are made of reed switches with extremely high sensitivity, high resistance and high cost performance. With quick response and high precision, the control is more accurate and timely, which can meet the needs of different projects. ???? ACTION RANGE: The action range of the two floats of the double float switch is 10 mm. If the demand control range is larger, you can use a combination of two float switches, so that there is a larger stroke to ensure that the pump does not start frequently. ???? PRINCIPLE OF OPERATION: The normal water intake process is activated by the float switch below and deactivated by the float switch above. Drainage process is activated by the float switch above, and the float switch below stops working. ???? MULTIPURPOSE: Stainless steel float switch can not only be used to control the water level (drain or top water) of water tank, swimming pool, water tank, fish tank, etc., but also can be used as the alarm switch for the upper and lower limit of liquid level. ???? NOTE: The float switch cannot directly control solenoid valves or high power relays, AC contactors, etc., a small relay (such as HH54P) is required for transition. Specifications: Voltage: DC 0-110V Material: 304 Stainless Steel Floating Body Length: 200mm / 7.87in Notes: Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List: 1 x Double Ball Float Switch Package List 1 x Double Ball Float Switch