Counter block for conveyors or pipe

I would like to have some kind of counter i can drop on any conveyor or pipe. It provides a simple service - count how many units have passed through on a time scale. You could also name the counters, and have a list you can pull up in the UI. They would show basic info - how many units have passed through in the past X time - displayed in a graph
I would really like to have this because the universal stats can't tell you about specific conveyors or pipes - it only tells you global info. But what if I want to know how many units have ran through X pipe/conveyor in the past 15 minutes? Well... counter block. A small insert on any conveyor.
I got the idea from another similar game, Factory Town.