The NRTR WATR Histogram indicator is a popular and free Forex indicator for MT4. It is designed to help traders identify price reversals and potential entry points in the Forex market. The indicator plots a histogram based on the NRTR (Nick Rypock Trailing Reverse) algorithm. The NRTR WATR Histogram indicator is a great tool for traders looking for an easy and effective way to identify potential entry points in the Forex market.