Whichever type you buy, just use the same type for the whole cycle (don't switch midway). In my experience, they all work (cheaper ones as well as spendy ones)
I use the Answer OPK test strips in the 20 pack. They have always been very reliable. Got preggers with my daughter while using them.
Is the Target brand a digi? I used the Answer brand too, before my RE suggested I go with the CBE digi. But because of cost I want to start using something cheaper.
Hey!! I usually use the answer opk. You can get them in the 7 tests or the kit which comes with a cup and 20 test strips in case you are not sure how long you cycle runs or when to start testing and incase it is hard to read you have extra if you need them. But they expire 30days after opening and are not supposed to use them after that. When I detect the surge I usually test again to make sure so these work better for me and cost about $19 at wal-mart