Electronic Sensors, Inc. (ESI) provides Level Devil ® American-made tank monitors, for local or remote tank monitoring — including some of the industry’s most popular sensor controller units. We have 
systems for single-tank or multi-tank installations (and most of our multi-tank controllers are also available in lower-cost single-tank versions).
Remote monitoring is available via cellular, satellite, WiFi/RF, Ethernet, or Bluetooth® communications — reaching your cellphone, smartphone or computer from virtually anywhere (using solar, battery or AC power).
Local displays and alarms are also available, and relay boxes extend the functions possible for our monitor/controller units, allowing them to be programmed to control lights, horns, switches, pumps, relays and other devices.
We offer (click either to select) :
* NOTE: Our MULTI-Tank monitors/controllers can also be configured for
SINGLE-Tank operations, sometimes at reduced cost,
offering you additional features for
SINGLE-Tank monitoring.