I ordered the TF100 Thursday, and received it this morning. Talk about fast!! Saturday delivery, too!!!
Having had a chance to play with it, I have a question (that I also had with the HTH drop kit.) When testing for color changes (TA test goes from green to red) the solution goes from green to grey in the span of a couple of drops, then a couple more drops turns it a very definite pink. From this point, continuing to add titrant will continue to change the solution to a more vivid red, until it finally stops changing.
At what point is the solution considered "red?" When it's pink? When it's the next step redder than pink? When it stops changing minus one?
The same thing applies to the CH test, going from red to blue. When is it "blue?"