I think Moving average and Zigzag is the good indicator for scalping.When i came in forex in newly,i used this indicators.It is very helpful for short term forex trader. but You can use any other indicator of other strategies, but it is necessary to calculate the value of the spread that usually kill senior brokers to trading accounts with few values can not do this practice. In this case you can search operations 5 or 15 minutes that are allowed and you can analyze the trend before it changes direction, you can close the transaction. Already operated on with scalping,