Resonating Redstone Crystal

The Resonating Redstone Crystal is a component added by Extra Utilities 2. It's a base component for most of the mod's machines, particularly those that generate or run on Grid Power. It can be found as an occasional extra drop when mining Redstone Ore and may alternately be crafted using an Ender Shard and redstone dust.

When held in hand it will display information about the current state of your Grid Power network in the same way other GP producing/consuming items do.