Block Matcher
The Block Matcher is a double-ended block that compares the blocks on both ends. If the blocks match, then it emits a brief redstone signal.
Comparators can be used to measure more subtle details, and they have a constant output. If the two blocks have the same solidity (such stone and wool, as opposed to air and logs), but otherwise have nothing in common, it will output a very weak signal. If the two blocks are made of the same kinds of materials, a slightly stronger signal will be emitted. If the blocks are absolutely identical, then the comparator will measure the strongest signal.
Workbench.name
Block Matcher
