hours . PT-100 is the best & the most user friendly piano tuning device ever made by Yamaha Co. Japan .  It has 8 preset stretch curves & very easy detecting visual stroboscope led screen with  high accuracy .  it's rare to find in this lightly used perfect working & cosmetic condition .   Super strong internal microphone  make it possible to tune the entire  low end & high end ( all 88 keys )  

  It comes with it's original AC Adapter , Carrying Case ,PT-SW1 Step Up & Down Switch &  User Manual.   Bid with confidence ,  return accepted if not as described .   Thanks for viewing my listing .  Features:  The PT-100 offers an impressive range of features, including many that   are not available on conventional tuning machines.   DOUBLE DISPLAY  The PT-100 includes two easy to read displays.   The LED (light-emitting diode) display shows the tuning   relationship graphically  while the LCD (liquid crystal display)   shows the current settings and machine status.  KEY TOUCH INPUT  Conveniently located keypad allows for easy data input and   operational control.  PORTABILITY  A build in rechargeable battery assures full portability.  CORDLESS OPERATION  A highly sensitive build in microphone eliminates the need for   awkward microphone cables.  EASY PITCH SETUP  The PT-100 offers a choice of ten basic pitch settings.  Make your selection by rotating the indexed PITCH switch on the rear panel.  REMOTE CONTROL  The remote STEP switch mounts onto the tuning hammer and   connects to the PT-100 by cable, allowing you to move the   setting up or down to the next note without reaching   over to the tuning scope.  TUNING CURVES FOR ALL STANDARD PIANOS  The eight built in tuning curves match the tuning characteristics   of all standard piano sizes, from vertical models to grands.