I use a micro-current facial machine with probes and this machine tells me when I have conductivity....or not. I had been using two other brands of conductive gel (topped off with a mineral spray to keep it moist) and I was having difficulty keeping conductivity contact. I would never think that there would be much difference in gels but when I finally tried 7E Gel, it was amazing....I had easy conductivity. Don't know what the difference could be but I'm grateful !!