public boolean check() {
            Object o = null;
            try {
                o = out.getFieldValue();
            } catch (Exception ex) {
                ex.printStackTrace();
                return false;
            }
            if (o == null) {
                return false;
            }
            if (o instanceof Double) {
                double d = (Double) o;
                if (!(min <= d && d <= max)) {
                    return false;
                }
            }
            return true;
        }