The APEX NRG XFR™ is the most advanced digital apex locator available, incorporating
  innovative Digital Signal Processing (DSP) technology plus Xtra Fine Resolution (XFR) to provide
  extreme accuracy and superior reliability for endodontic treatment. Measuring the distance to
  the apex during root canal procedures, this latest generation locator is guaranteed to provide an
  accurate reading in wet, dry, and even bleeding canals.
    Compact and lightweight (only 36g), the new APEX NRG XFR is the most advanced apex locator
  of its kind. Based on DSP (Digital Signal Processing) technology, it provides superior reliability
  and quality. Other comparable locators use an analog signal that is transmitted over long cables
  – diminishing the signal and increasing the probability of distortion. The APEX NRG XFR uses
  sophisticated, proprietary software that converts the analog signals to digital and transfers them
  through short cables – preventing external influences and distortions of weak and sensitive
  signals thereby allowing a clear and accurate display of information. The multi-frequency
  measuring system accurately calculates the average of the signals received.
    The depth of the file’s progress is represented on the APEX NRG XFR by 8 multi-colored LEDs,
  with indicators distributed every 0.25 millimeters. An audible alarm starts at 0.5mm and alarm
  frequency increases as the biological apex is approached.
    Thanks to its small size, the APEX NRG XFR is easy to store and convenient to use. It can be
  clipped anywhere, at a very short distance from the oral cavity, which greatly reduces operator
  movements and fatigue. Place the APEX NRG XFR in the field of vision near the mouth of the
  patient during root canal treatment and easily follow the progress of the file. Its battery is easily
  replaceable and will last 500-800 treatments. For greater convenience, cables and accessories
  are autoclavable.