This technology features two indicator scales that allow you to see the detector's discrimination setting (Lower Scale) as well as the analysis of each detected tart (Upper Scale) Enhanced Iron Resolution (additional resolution for separating desirable tartsfrom iron junk in cluttered areas) and a standard 8.5" × 11" elliptical Double-D searchcoil engineered for performance in more challenging mineralizedsoils. With One-Touch operation, theMD-6350 powers on with the touch of a single button, adjusts easily for groundminerals and is immediately ready to begin searching. You can expect 20 to 40 hours of operation depending on battery type andquality.Access and replace the batteries by sliding the cover off the controlhousing. Lower Scale-The lower scale, or Notch Discrimination Scale, indicates thediscrimination pattern. The MD-6350 will produce an audible tart responsefor the pixels that are switched on, and no audible response for those thathave been switched off., Manufacturer: CFWWSAQ