Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type {without mechanical transmission elements} using magnetically actuated indicating means
Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type {without mechanical transmission elements} using magnetically actuated indicating means