i'd love it if somebody could add a bit on what the heck use it is my experience so far involves a physicist who always worked with a i was running physical experiments on the device he had derived a theory for he insisted the device would have no magnetic field i whipped out the gaussmeter and measured the magnetic field he would not accept the readings as he considered the b field an illusion yet he was unable to direct me to an instrument that could measure vector potential and could not convert a to b due to the pesky gauge factor problem