It will help you determine following
Difference between high and low
These values will help you take buying decision when a candle stick pattern is created and will easily help you determine the buying price and target price in a glance.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.