Np. A way that is more reliable can be done using logic gates. The way that I have done it is by putting logic gates in the way of items going into a structure, and having those logic gates open when an product comes out of the structure. So the logic gate source is set to a point on the output conveyor belt.
Edit: the waste bin is there to make sure that no items get stuck on the output belt if the chest is full, as this would break the system.
