Like the standard Watchman Sonic, the Watchman Alarm consists of a transmitter and receiver unit. The transmitter unit is fitted to the tank and measures the level of fuel inside. This information is relayed wirelessly to the receiver unit, which cleverly and conveniently plugs into a standard 3 pin domestic socket, where it is displayed via an easy to read LCD display.
In the event of a sudden drop in the level of fuel stored inside the tank, an alarm is activated on the receiver unit, alerting the oil tank owner and allowing necessary action to be taken.