Glad to hear your enjoying your tub. When this question comes up, the Taylor kit gets most mentioned. I am very happy with an Aqua check meter that I have. It has special test strips you must buy that are more expensive, but you dip, put it on the meter and get the digital reading. I can read most test strips enough to see how my tub is doing with the exception of PH. I like the Aquacheck meter specially for the PH. It does seem to be very repeatable and when I use it to keep my PH in line, my tub does well. After 13 years I know my water well enough that if I keep my sanitizer level up and my PH in the proper range everything else stays in line till I change the water. I have no idea how well this meter works with Bromine. I mentioned the strips were expensive, but I have bought them off Amazon cheaper. I probably only use to two strips a week, so I make them last.