I mainly use my own perimeters. It all depends on what type of trades you are looking into. I am a bounce player so I have my nasdaq plays set at a drop of 15% or more. For the pink and otcbb's I set the % much higher. There are so many selections you can make - you have to decide for yourself what type of plays you are looking for - volume, % up, % down, new highs or new lows, etc.
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