glo plug igniter will have to charge prolly around 16hrs for the first time and to check a glo plug you have to FULLY insert it into the glo driver (pull the handle back, insert plug, release handle) don't leave the plug in there for more than a few second's cuz you could burn it up....
i have a glo driver with the same stupid meter, i feel like ripping the meter off so it fit's in my pocket better! a glo plug either work's or doesn't work, if you have a "bad" plug you will know just by how the car is driving or not driving lol