EF/MEF Series are by-pass level transmitter product lines, more commonly know as magnetic level gauge devices that can be equipped for local visual indication only or with level switches and an electronic level transmitter output. The magnetic level gauge units include their own self-contained chamber that would be mounted to the vessel, typically via side connections at the top and bottom areas of the EF/MEF by-pass chamber. The EF is standard size and MEF is a smaller “mini” version. These magnetic level gauge units are safer than glass gauges that they typically replace.