Vex

Well, there's no easy way to do this unfortunately. But if you really want to, you could use a EU detector cable attached to a CC computer and write a bit of code to time it and the time multiply by however many EU your network outputs. Unfortunately, the big flaw with that system is consistency, I'm not shure if there's a way to make shure that you would be getting EXACTLY however many EUs constantly.

Slightly better way- stack the cropmatrons (I recommend two, weed-ex lowers stats) and put some RP2 tubes next to them, then it's as simple as painting the tubes, and filling them with an (preferably) un-stackable item like buckets. After that, just remove the buckets from one row, and tag your imputed fertilizer, hydros, or weed-ex with the corresponding tube color.