Your current signal finder should be fine, providing you are using it correctly.
Initially you set a cheap signal finder to be very sensitive, this should provide a signal quality reading even when not pointing at a satellite, you then gently move your dish, East/West, until the signal reaches maximum, you then decrease the sensitivity, until it's aroung 50%, move your dish again, until it reaches maximum, then continue the process until you have the best possible signal, you also do the same for the dish elevation.
Once you have the best signal quality possible you check your receiver, to see which satellite you're aligned to.
There are several videos, on youtube, showing how to use different meters, like this one: