Description

The Watchman Sonic is a wireless content gauge, which uses an ultrasonic measuring technique that continuously measures the fuel level.
Reading: the contents of the tank can be read on the display in steps of 10% per dash, at 20% (2 dashes) a filling gun appears, at 10% (1 dash) the red light also lights up and you will hear an alarm signal.
Alarm if the fuel level drops by more than 3 cm per min.