Magnetic level gauge (magnetic level indicator) uses float chamberand liquid tank (or container equipment) to form a connectivitystructure, so that the liquid level of the two are the same. Under theaction ofliquid buoyancy, when the liquid level rises (falls), the float ofthe liquid level rises (falls), and the permanent magnetic steel in the floatdrives the magnetic red and white roller to turn by 180° under the forceof magnetic coupling, thus the liquid height could be displayed clearlyand visibly by the white and red demarcation line in the indicator.