Tank level alarm system LS-2 has two sockets for sensors. Is sold with one or two sensors (depends on order) for electric conductivity fluid. Sensors are made of Stainless Steel with resistant to petroleum products intermediacy and can be used in various aggressive environments. Sensors are sufficiently heavy, to be used in many thick liquids without additional weight. Control module has big alarm  LED indicators and relay NO / NC connectors, that can be used for sound alarm, pump or connection of other equipment.