This is a simple indicator which will mark High & Low of last three days.
Close of Previous Day
The High lines will show in RED color, Low lines in green & close lines in Yellow.
The advantage of using this indicator is - It will greyed out or fade the color of any previous day level if the price is breached of that level.
For example if 2 day's ago High price is breached by 1 day's ago High, then the 2 Day's ago High level color will greyed out in current day chart. Thus giving you a confirmation whether it's a fresh or already tested levels.