This is one of the easiest apps to operate. My electricity is out on my house, so it has shown me what to not touch. i'll leave that high voltage to the professionals. You set the parameters for whatever situation you're in, and once you hit the start button, it's less than a second before you get a reading. I saw right away that I was looking at something. I had no business messing with. Safety first prevents the worst, try MY ELECTRIC METER TODAY!!!!!