Weighted Pressure Plates are a special type of Pressure Plates that emit a different Redstone signal strength depending on how many items are on the plate. They were added in Snapshot 13w01a. There are 2 different kinds, both with different recipes: Light and Heavy.
|Weighted Pressure Plate(light)||Weighted Pressure Plate(heavy)|
|Gold Ingot||Gold Ingot||None||Iron Ingot||Iron Ingot||None|
The signal strength emitted is as follows:
|Signal||Gold Plate||Iron Plate|