... temp:-20~+125 4.Certificates: CE, RoHS,FDA Level Switch Characters:1.Low cost: cheap material2.long life ... the float ball moves along the stem with the water level, the magnet inside the ball will cause the ... to prevent overflow or to prevent dry-fire. Application:water heater, water dispenser, air-condition, air-cooler, BSD-P, humidifier ... forward to working with you as partners !! Water Level Switch