Chaikin Money Flow (CMF) measures the amount of Money Flow Volume over a specific period, typically 20 or 21 days. The resulting indicator fluctuates above/below the zero line just like an oscillator.
Chaikin Money Flow sometimes only briefly crosses the zero line with a move that turns the indicator barely positive or negative. There is no follow-through and this zero line cross ends up becoming a whipsaw (bad signal). To avoid the false positives, this implementation of the CMF two thresholds: the bullish threshold a little above zero (+0.05) and the bearish threshold a little below zero (-0.05).