PARKER MCCRORY MODEL DF-SP-LI. Features Exclusive Built-In Performance Meter. Shocks Through Wet Weeds And Brush. Laser Trimmed, Computer Precision, Solid State Circuitry Provides Reliable, Low Impedance Shock To End Of Fence. For Livestock Control In Small To Medium Size Pastures. At A Glance Built-In Performance Meter Shows You The Fence Condition; Good, Marginal Or Bad. …