... temp:-20~+125 4.Certificates: CE, RoHS,FDA Level Switch Characters:1.Low cost: cheap material2.long life ... send the control board a signal that the liquid level is at the predetermined position, then we will ... know the condition in the tank.there are usually two way to use the float switch, to prevent ... -P, humidifier, dehumidifier,fluid control,a pump,an indicator,an alarm,or other device. If there is no ...