If you would like to convert your TF-100 test kit to a TF-Pro...here is the case. The Speedstir will fit in the same hole as the Smart Stir, and there is a little room to spare with the Speedstir as it does not have the curved handle. You will need to buy 3 two ounce bottles of CYA reagent as opposed to 1 eight ounce bottle. There are also dedicated TF-Pro CYA view tubes and CYA mixing bottles for everything to fit perfectly. There is a mesh netting if you need to fit any of your unused chemistry inside.