I just received my TF-100 and performed my first tests this morning. It's a very nice kit overall. I just have a couple of minor issues. The 8 oz. bottle of R-0013 (CYA reagent) has one of those caps that you press on one side and it opens on the other side. That cap makes it difficult to pour into the CYA mixing bottle without spilling, at least for a shaky old guy like me. I would prefer a cap like all the other reagent bottles. Also the R-0010 bottle is only 1/2 oz. and you have to use 10 drops for every CH test. I think that bottle is under sized compared to the other bottles in the kit.