This was posted on an RC thread (Spotter's thread on his 280 Custom upgrade): post #739

This works. Not as squeaky clean and easy as the video, particularly the "wiggle" method of opening the packet (you have to cut off quite a bit of each edge, then may have to pull apart a little) but this works soooo much better than what I was doing (which was dumping the reagent onto a folded index card)

This is particularly useful for the Hanna Checker Phosphate/Phosphorus kit.