Interior alarms from Septronics can monitor high and low liquid level conditions of a tank, filter or sump. Single or multiple control switches activate an interior audiovisual alarm. The horn can be silenced, with an LED light that remains illuminated until the liquid level returns to an acceptable level. Whether using a single alarm or dual alarm with a color-coded alarm indicator, the units will automatically reset, and plug into a 120-volt outlet. All units come completely assembled, have a power-on light indicator, 9-volt battery backup safety feature, an external mounting system and quick disconnects to simplify installation, and automatic alarm reset and horn silence to simplify usage. 262/567-9030; www.septronicsinc.com.