... , fuel, propane, butane, phosgene, chlorine acid, based, steam, oil, etc.Magnetic Level Indicator consist of a chamber and anInternal float in ... in two designs. The simpler & economical desiign consist of red magnetic capsule follower, that moves within a glass tubeFilled with water ... other system is expensive and consist of a bi-colour rotating roller, white on front side and a contrasting red colour ...