An acoustic gauge that measures the height of the liquid in the tank,
A radio emitter that sends this information to a local display,
A local display that simply plugs into an electric socket and displays a number representing the level of liquid in the tank (9 = 90 %; 8 = 80 % etc.),
A red LED that flashes as soon as the level in the tank descends below 20% in order to warn the user that it is necessary to order fuel from his supplier.
INTERNET USERS ALSO CONSULTED ON THE CATEGORY MANOMETERS, VACUUM METERS