Fringe : Season 3 : Episode 20 : “6:02 AM EST”
Tensions start to build up for the finale of season three with Walternate activating his Machine and the Fringe team on Earth-1 scrambling to counter-activate theirs. Seeing as Fringe has been renewed for a fourth season, I somehow doubt that Earth-1 will be destroyed.
When examining the granite, Walter uses a piece of equipment that looks like an analogue multimeter, but that emits clicks like a Geiger counter. Presumably he is measuring the potential difference between the terminals (as seen by the needle moving), but then what are the clicks for?