I can't answer about the FAS test being better or worse than OTO, but Taylor also makes a kit called K-2009 which is the fas-dpd, phenol red pH test, and CYA test. You could remove the cya reagent from the kit and stick it in your 2006 box since that one runs out very quickly anyway.

Unless it's the DPD powder you don't want them handling?

http://www.taylortechnologies.com/pr...D=1&KitID=2238