Thinking about investing in one of these because it seems more accurate to count drops and multiply than to match shades of color. Perhaps it's just my eyes but I've been using test strips and a simple test from Leslie's (18-5540) and been very frustrated. It seems to me these methods are much too subjective. Am I right that the TF-100 is more accurate? Also, are all of the tests done using a calculation rather than guessing at a shade of color?
Many thanks for your advice,