This item is currently WIP (Work in Progress) and is subject to large changes on any update.
The Ore Meter is a tool from the Twilight Forest mod. The Ore Meter will scan all chunks within a circular 3 chunk radius of the user for all of it's ores. It will output the ores, their value, and the percentage of ores in the chat window on use. The first number it outputs after the ore name is the value, not how many there are. A value is based around how close the player is to the ore. The second number is the percentage of the ore in the ground around the player.
Simply use it on the ground to activate the device. It should say all three values in the text box, ore name, value, and percentage.