that would depend on what the ph of the tea is. If it's low it will gradually lower the ph but if your soil ph is very high, probably not enough. Till you can test the ph your just pissing up a rope.
I also use an accurate 8 for soil testing as well as a hanna combo for liquids. If you look around you should be able to find the accurate 8 for about $50, the hanna combo for about $130. With the hanna you can capture the run off from you feedings and test it. It will give you a reasonably accurate indication of your soil ph, although not as accurate as a soil probe.