I've been using a basic Chlorine and PH kit for our pool for years and honestly, I can just look out the window and tell what's up with the water 95% of the time. With a tub it appears that there are more things to test for and while I love gadgets and science I'm not one to fuss over these things. So...I see the Taylor 2005 kit and several other brands of what appear to be similar kits. Poolmaster, etc seem to have similar kits.
So, buy the Taylor and be done or do these $20 kits suffice?
Thanks