The SludgeBoss Float Switch from Sump Alarm is self-orienting and mercury-free. It can hang freely into a septic tank (or be tethered) and will orient automatically when the water level rises. It is rated up to 250-volts operations at up to 13 amps or 1/2 hp. It is suitable for 20 degrees below zero to 140 degree F conditions and is offered in piggyback and wire lead versions. 314-787-8059; www.sumpalarm.com.