Sensor Systems WATCHMAN SONIC Oil Level Monitor.
Checks the level of oil in your tank, for peace of mind.
Keeps an eye on your oil usage so that you won't run out.
HOW DOES IT WORK?
The transmitter sits on top of the tank and ultrasonically measures the level of oil in the tank.
It then transmits the information to a receiver unit that's plugged into an electric socket in your house.
The height of the oil is displayed on an LCD screen on the receiver.
When the level of oil falls below 10%, a fuel pump symbol appears, telling the owner it's time to order more oil.