Suunto Optical Height Meter PM-5/1520 is an instrument for measuring heights, especially heights of trees, with great accuracy and speed. The body of the instrument is corrosion-resistant anodized aluminium-alloy. The scale card runs on a special bearing in a hermetically sealed plastic container filled with a liquid which guarantees that it runs freely and stops quickly. The liquid will not freeze, retains full damping properties in working conditions and eliminates irritating scale vibrations.
A rubber cover is available for this instrument. It is recommended to purchase the cover as it will help to protect the height meter.