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http://www.trade-ideas.com/Help.html#wsf_MinVol5 These compare the volume over the last 5 minutes to the volume expected in a 5 minute period. The result is always a percent. If you set the minimum volume to 400 then you will only see stocks which have been trading at least 4 times as much as normal in the last 5 minutes. Set the maximum volume to 90 to see stocks that have been trading less than normal over the last 5 minutes.