The Liquiphant FTL31 liquid level switch from Endress+Hauser is based on vibrating tuning fork technology. Designed for the chemical, oil and gas industries, the switch can be installed in any vertical or horizontal position in a vessel, pipe or tank. It has a 316L stainless steel housing and works in process temperatures up to 302 degrees F and pressures to 580 psi. 888/363-7377; www.us.endress.com.