Gerfx Density Scalper EA Review A night scalper, The Gerfx Density Scalper EA will trade reversals on the nightly ranges for various currency pairings. The EA is quite sophisticated and employs numerous filters and security procedures. Pairs to consider: are GBPUSD, GBPCAD, GBPAUD, EURAUD, USDCAD, USDCHF, AUDCAD, and EURCAD. Other optimal pairs include EURUSD, EURGBP,