Hammer (GregTech 5)

The Hammer, sometimes called the Hard Hammer, is probably the first GregTech tool you will make. It is used to craft 2 metal ingots into 1 metal plate, necessary for creating all GregTech machines. The Hammer can be made of almost any metal, and is the only tool that can be made without plates. After its use in plates, the Hammer is used in the crafting of Bronze Machine Hulls and Steel Machine Hulls and almost all tools.

The Hammer also has three in-world uses.
 * Right-clicking a machine with a Hammer toggles whether or not the machine accepts automated item and fluid input, and whether or not it will automatically output items and fluids.
 * Ore blocks mined by Hammers will drop one Crushed Ore rather than their regular drops. Gem ores will drop one Gem in stead.
 * Prospecting

Prospecting
Right-clicking on a block of native Stone (or Granite) in the world will 'prospect' the area. A random selection of 25 blocks within a 5x5x5 cube behind the targeted block will be scanned, and the results will be displayed as a chat line. The prospecting algorithm works in part based on the block's coordinates, so scanning the same block multiple times will not give different results, however prospecting different sides of the same block will. Prospecting is designed to detect anomalies in the underground landscape. These anomalies can be dirt, gravel, or Granite ("Material is changing"), caves ("an air pocket"), ores, water, or lava. Prospecting a single block can only tell you one thing, so it's usually best to prospect several blocks in a small area to get a more accurate idea of your surroundings.