The way it seems to be set up, the amps used only show up while the fire button is being pressed. This seems completely useless, you would need a mirror to ever be able to see the reading. I got it to display the 'last power used', but I think that might be some reading for the amount of juice I sucked out of the battery. Just wondering if there is a setting to get the amps to stay on the screen long enough for me to look at them.