These professional height-measuring rods are designed to meet the medical-grade accuracy professionals depend on. Their high-quality aluminum construction, to its durable ABS plastic, these easy-to-use and simple height-measuring rods are built for long use. Its retractable design and folding headpiece make it compact when not in use. Product Description HM201D is an optional digital height measuring rod for column scales with Measuring range 120~200cm Division 1mm Power supplied by scale. Without LCD display The most easy to use digital height rod