Just got my TF-Pro kit after using a Sutra for a few years. No complaints on the Sutra other then having to pay a fee all the time. I can test on my own I think and this is more accurate. Also want to get better at Salt water balance. been winging it (using the chlorinator itself) as the meter. I know there is a better way. Glad to be here and Thanks for all the advice over the years and going forward.