Bolinger band is good indicator for scalping and we can use upper band and low band to confirm the reversal point. Others indicator that can be good for scalping is combination of 2 MA which each MA use different periode, example MA periode 10 and 20.
I believe just the MAs based on the market and some momentum indicators most especially the usage of Stochastic RSI indicator is actually a very easy and simple way to day trade. Asides from having to monitor the market steadily every now and then, I want to believe this is actually one very good way to have a strategy, stick with it and be able to make very good short term market decisions as the case may be. Bollinger bands to me seem a bit too laggy, probably one of the reasons I do not fancy it much.
I think scalping is not profitable. You spend too much time on it, and do not always go out in profit. It is better to trade in the middle and long term. I would recommend to study the price action for scalping, if you still intend to engage in scalping.
I have been scalping for the past 2 years and I can tell you it is very profitable but risky. I think it is that risk part that a whole lot of people do not understand and they tend not to try as much as possible to learn all they can so as to be able to do better scalping but the idea of making quick bucks from trading without knowledge has led so many people into trying to scalp the market and failing and with the huge risk, you can quickly get frustrated when you do not have a strategy.