A scanner is nothing but a set of buy/sell rules which a trader defines after he/she manually backtest his/her ideas on charts. It is a method to translate your trading ideas into a rule so that you dont need to manually scan in future
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Not all signals from a scanner can be traded. While it gives you results at high level you are still expected to check charts if it meets all the requirements of a trade & then take a trade. Set right expectations from the scanner. Be reasonable!
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