Suunto PM5, 1520 manual Optical Height Meter, Instructions for USE

PM-5/1520

OPTICAL HEIGHT METER

Suunto 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.

INSTRUCTIONS FOR USE

When measured from distances of 15 m and 20 m, tree heights can be read straight off the instrument’s scales. The readings should be doubled when measuring from distances of 30 m and 40 m. The Suunto Height Meter can also be used to determine the angle of a gradient. This is done by taking a sighting along the line of a gradient using the 20 m scale on the left of the instrument. The reading obtained can be checked in the conversion table on the back of the instrument to obtain the angle.

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