Here's where the StockCharts.com scanner is mentioned: http://stockcharts.com/school/doku.php?id=chart_school:scanning:tutorial
Thanks all for your responses. After a lot of research and finding that none of the mainstream scanners out there can do it, I finally found one...
I'm looking for a stock scanner that can find stocks between $1 and $20 that gapped up at least 8% premarket, which can run this scan for any day...
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