code: private String[] getValueToleranceRange(ColumnValue value) {
  		double doubleValue = ((Number) value.getValue()).doubleValue();
  		double tolerance = value.getTolerance();
  		return new String[] { Double.toString(doubleValue - tolerance),
  				Double.toString(doubleValue + tolerance) };
  	}
docs: Get the value tolerance range min and max values
  
  @param value
  @return tolerance range