Do you mean that you want a screener to give you a list of stocks that have hit the 50 MA and turned? The criteria you'd enter into your screener software (ProRealtime.com is free for EOD) could be only return stocks where:
Today's open is higher than 50 MA. And
Today's low is lower than 50 MA. And
Today's close is higher than 50 MA.
You could use the right side of your noggin to quickly look at the list and determine if the bounce is satisfactory for your needs.