Product description When the float goes up and down along the fixed support or shaft under the liquid buoyancy and swings up and down, the permanent magnet at the end of float fixed shaft swings accordingly under lever function, which consequnetly drives the micro switch in the junction box to move and output the on or off signal for alarming or remote control. Installation method: A. Keep the electrical interface of the junction box downward, please choose anti-corrosive type sl80/sl81 for acid and alkaline liquids B. Please keep the float and the linkage rod away from the connection tube