Just had my pool resurfaced. For the first two weeks, I relied on Leslie's and another local pool store for pool tests until I got my TF-100.
Did my first test today. I've got a SWG (Autopilot)
FC=17
CC=2
PH=7.5
CH=600
TA=80
CYA=30
The Leslie's results were very, very close to the TF-100...