Item monitor

The item monitor is a block available since MaddTech 1.1, which has an item input and a redstone output; the sides to be inputs and outputs can be changed by right-clicking it with a screwdriver.

The GUI allows you to set a "signal condition", for example "glowstone < 20", meaning that if the inventories connected to the input contain less than 20 glowstone in total, there is a redstone signal at the output, announcing that fact. It could then trigger machines responsible for providing more glowstone for example.