Patent ID: 8539828

Claim:
A fluid level probe for use in a tank containing a first fluid, comprising: a probe shaft including a top end and a bottom end; a first float carrying a first magnet, the first float being slidably disposed for movement along the probe shaft and adapted to float at a top surface of the first fluid; a second float carrying a first magnet, the second float being slidably disposed for movement along the probe shaft beneath the first float and adapted to float within the first fluid such that there is magnetic repulsion between the first magnet of the first float and the first magnet of the second float; and electronics operative to determine a first distance between the first magnet of the first float and the first magnet of the second float, wherein the mass of the first float is greater than the mass of the second float such that the magnetic repulsion between the first magnet of the first float and the first magnet of the second float has greater effect on the second float.