This script allows you to view ATR extremes based on the open of the candle. Average True Range gives you the average move of an asset during a period of time. If you're viewing the Daily timeframe , The Average True Range represents the average size of a move that occurs in a one day timespan over the specified period. Reaching the upper or lower boundary could signify that a trend is reaching exhaustion as the asset is reaching it's expected move for the period.
You can manually set a timeframe to use for the ATR value. By default, we are viewing a Daily timeframe . For lower timeframe trading you may want to look at the hourly or four hour ATR range.