What is this indicator?
Combines the change in price and trading volume to measure the real strength behind every price move. It crossing the zero line together with high volume is a stronger signal than a price change alone.
How to read the chart
A rise happening alongside price movement confirms that move's validity; a divergence between volume and price is often a sign of a weakening trend.
Practical tip
Always check volume alongside price movement; volume on its own, without regard to the price trend, isn't a reliable signal.