In my opinion parabolic SAR and stochastic are together best indicator for scalping. Hence, scalping is too risky as most of the traders will name it as gambling but still a good amount of profit can be picked up by scalping. Scalping never follows any type of trends so excellent strategies don't work with its time frame. For scalping, a trader should always be updated with news because impact of news is most significant on scalping time-frames.