Abstract: A bistable liquid level indicator has a rotatable, indicia bearing member which is balanced to assume a first position under the influence of gravity. A rotatable fluid responsive actuator is magnetically coupled to the indicia bearing member such that a magnetic force, which varies as a function of the fluid induced position of the actuator, is imposed on the indicia bearing member. At a critical level of the fluid, the imposed magnetic force overcomes the gravitational force and the indicia bearing member moves to a second position.

Abstract: A liquid level indicator has a housing which defines a pair of fluidly isolated chambers. A flag including a first magnet is pivotally mounted in a forwardly disposed of the chambers and a lens is mounted in the front of the forwardly disposed chamber. An arm is pivotally mounted in and extends out of the rearly disposed of the chambers, a second magnet is attached to the end of the arm which is disposed in the rearwardly disposed arm, and a float is attached to the other end of the arm. The first and second magnets are permanently magnetically coupled so that movement of the float will cause arcuate movement of the second magnet which is translated to rotational movement of the flag and its integral first magnet.