public final double sampleMax(){
  long count=_acquireCount.get() - _releaseCount.get();
  long max=_max.getAndSet(count);
  return max;
}

public final double sampleMax ( ) { long count = _acquireCount . get ( ) - _releaseCount . get ( ) ; long max = _max . getAndSet ( count ) ; return max ; }
return the probe ' s next sample .
