This is a simple gauge of volatility using the Coefficient of Variation.
COV is calculated by dividing standard deviation of price by the expected (average) price.
Custom color scheme indicates increases and decreases in volatility, which is indicated when the COV forms new half period highs and lows.
This is a simple script to quickly see changes in % in each candle.
In blue open/close variation. In red Histogram with range between high and low.
This helps me understand very quickly what's the typical change in % for a specific timeframe/pair, so I can fine tune my Stop Losses and Take Profits.