public final double sampleMin(){
  long count=_acquireCount.get() - _releaseCount.get();
  long min=_min.getAndSet(count);
  return min;
}

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